Thank you to NetGalley and to the publisher Angry Robot for the digital ARC, it has not affected my honest review.

TW: suicide, animal death, death, blood, violence, panic attacks, body horror, toxic relationships

Cyril Laverne has spent the past ten years hiding in a hut by the sea, trying to catch fish for his cat familiar, Shoestring, and avoiding the mistakes of his past as a former grand high mage of Farsala. The kingdom lies in ruins, and Cyril blames himself because it was his husband- King Eufrates- who destroyed it through madness and violence while Cyril stood by and let it happen. Now an old man, Cyril can’t help but think back on the life he once had and what he would change if he could. When Shoestring wanders away and dies, Cyril knows he doesn’t have long left without that piece of his soul. With his remaining lifeforce, Cyril casts a spell that propels him back through time and into the body of his younger self to a much happier time- when twenty two years old Cyril and bard prince Eufrates were still side stepping their feelings and Eufrates’ brilliant sister Tigris was alive and destined to become Queen. If Cyril can stop Eufrates from taking the throne of Farsala, he might just be able to save the entire kingdom from its doomed fate. However, the vows that Cyril made on his wedding day mean that he and Eufrates are forever bound, and soon enough it becomes clear that the modern Eufrates has also been pulled back through time. Trapped together in their own history alongside their husband turned enemy, Cyril and Eufrates are forced to relive the worst year of their lives- and what they both know is the beginning of the end unless they try to change the future.

This book starts out in rough and distressing circumstances after the end of the world but Cyril’s old man narration adds to the dark humour and unique, beautiful vibe so perfectly that it doesn’t feel wrong. The amount of times I laughed was ridiculous considering how it started but ‘Shoestring Theory’ is ultimately a lighthearted time travel story I couldn’t put down once I started. As he grows comfortable in his younger self again, and more focused on changing things now he knows the end, Cyril is such a delightful main character. His relationship was the end of an entire kingdom, Eufrates never used to be like this and the reader can see why the two fell in love. I loved getting to see all the different sides of it, from first love to just married to pure enemies, especially when it becomes clear that old man Eufrates is also here because of Cyril’s magic based wedding vows. Shoestring might die at the beginning but his younger self, no longer Cyril’s familiar but just a regular cat, is a complete delight, as is Eufrates’ doomed sister Tigris and Cyril’s legendary mage aunt Helene. Time travel is one of my favourite tropes, especially when it’s done with originality and heart, and this book has that in abundance. I’m so glad I read this one.

There were parts I really enjoyed, but it also had some elements I really don't like reading about. The climax also felt too easily obtained. I'd definitely recommend it for someone who doesn't mind certain tropes and reads it mostly for the romance. It just wasn't right for me.

thanks to netgalley for providing me an e-arc in exchange for a review!

this had alllll the fun tropes in it. time travel, friends to lovers to enemies to lovers, kind of a second chance romance, so much angst and pining. this story had a lot of revealts/revelations and sometimes that can tire me out, but this one did not do that at all. it was well constructed, the characters are all morally gray but understandable. highly recommend if you like romantasy with a little more serious plotline.

What a fun plot and engaging characters. Friend to enemies to lovers. Cozy fantasy. Time Travel. Oh what a fun read this was! The set up was heavy in the first couple chapters, but overall what a great story! 4 stars

Shoestring Theory is one of those fantasies that focuses more on the characters than building a lush world for them to inhabit. A map of the kingdoms would have been quite helpful. The time travel aspect and its inevitable surprises kept my interest. It seems like a sleepy, cozy fantasy, but also quite twisty and surprising. Hefty topics and certain events (especially in the beginning) had me leaning away from really considering this to be a cozy fantasy. They did lend more depth to the characters and the situations they found themselves in.

I didn’t feel particularly drawn to any of the main characters but I would have loved to learn more about Cyril’s grandmother. I love that each character has flaws. Those flaws weren’t just tossed out into the story without exploration, growth, or grumbling from other characters either. The character dynamic was one that I hadn’t seen in a while – where they had all known each other for their entire lives.

Overall, I enjoyed this quirky little fantasy. The characters and their relationships with one another paired with the seemingly straightforward (it’s not haha) plot made for quite the read. The pacing could be massaged a little bit to help keep the story flowing but it didn’t break it for me. Many thanks to Angry Robot Books for the gifted copy to read and review – all opinions are my own.

Thank you NetGalley and the publishers for the chance to read this book! Friends to lovers, time travel AND CATS!!! 5 stars for the cats alone.

I had a suspicion I would enjoy this book, but I hadn't realized how much! I fell in love with the main characters and miss them already. It was fun that the story had an element of mystery to it. And despite the heavy beginning, there was actually quite a bit of hope in this story. I'd love to read more books by this author!

Thank you to NetGalley and Angry Robot for the ARC.

While enjoyable, I feel that this book was rather marketed wrongly. I wouldn’t call this lite fantasy at all. With war threatened between the two nations and threats of torture from Cyril’s former husband, it kind of felt too dark to be called anything like cosy.

I also was very disappoint by the lack of the cat. While it says in the blurb that the cat dies early on, I assumed that since it was a time travel fantasy that the cat would be alive in the earlier time. But it was not. And that was honestly very disappointing. It lent a very dark air to the start of the book. I also didn’t buy Cyril as an over fifty-year-old master mage. He seemed a lot younger than that personality-wise.

What this book was though was chaotic. Cyril was a disaster queer and that led to quite a few hijinks. I enjoyed how queer this book was and how pretty much every character was a walking disaster. It added a fun element to the book that was otherwise lacking.

I think if this book had been marketed differently, I might have enjoyed it a lot more. It’s unfortunate really.

I love love love this!
The characters, the plot, the humour, the writing - everything worked so well together!
I loved Cyril and Shoestring as a duo, and the antics they get up to kept me hooked to this story. I loved the twists and turns which definitely weren't expected and I'm a huge fan of the direction this story took.
I'm all for this genre of fantasy - slightly cosy but with some higher stakes to keep you interested.

DNF - I really have to stop trying Angry Robot books, the writing styles never agree with me. I found this one so clunky, heavy on the info-dumping and telling-not-showing. Not objectively awful, but not great, either.

dnf @ 11%


I had really been looking forward to this one!! I was on the fence because while it's not portrayed as a cozy fantasy, the marketing made it feel like it could lean that way. (& I'm still not entirely sure if it is or isn't cozy fantasy -- the stakes are definitely higher than cozy fantasies, but I felt little if any tension in the part I read.)

The concept is super, super compelling to me, but I didn't find myself caring about any of the characters or the setting or the plot. So evidently this book is not for me.

That being said, I do think that people who like cozy fantasy would likely connect with & enjoy this book!

I've been a fan of Mari Costa's comic work for years, but with this being her first novel, I decided to keep my expectations realistic about the prose. I have to say I was pleasantly surprised by a book beautifully written, with prose that is evocative in ways I've never seen in other books. When a new character or location is introduced, the clarity of their descriptions makes it so you can feel you're seeing them exactly as the author intended. The dialogue was also on point, (which is no surprise), though I wish there had been more of it. That's where the author makes you laugh the hardest.

I have to say, when I read that this book was enemies to lovers (plus all the fantastic promotional art she's been posting on socials), I expected a more tragic and dramatic story. I felt disappointed in Eufrates as a villain, whom I wish was more unequivocally evil. When we learned the history of his tyranny, I thought, "Wait, that's it?", and his actual character during the story was a little underwhelming. He doesn't feel like a real threat until way past the first half of the book.

(SPOILERS) I know there's an explanation for that, and that Eufrates was never truly bad, but that's something I'll touch on below. Personally, I think if a book starts with a character committing suicide to travel back in time to kill the love of his life, the stakes have to be a little higher than what he ended up doing, even if he wasn't fully at fault. By the time the real villain is revealed, I was so starved for an evil guy that I almost rooted for him instead. (SPOILER)

I also feel the magic system wasn't explained well enough for the twists to hit as hard as they could, just a vague idea of what is easy or hard to do. The political intrigue in this book doesn't really do it for me either, since aside from the main cast, there isn't any other named character who last more than a scene.

Now, if there's one thing Mari does well in any medium, it's the romance. The actual moments when the main couple was allowed to be in love were so, so, SO SWEET, and in the end you can't help but root for them. By the end of the book, I was at the edge of my seat waiting for them to just get it together and admit their feelings for each other. I also really loved what we got to see of Eufrates before becoming a king, when he was a young bard with no interest in politics. That side of him really makes it all the more tragic that he ended up where he did.

(SPOILER) While I don't think Eufrates wasn't as evil as I would've liked, I really like that he doesn't accept the truth behind his actions as an excuse for what he did. It would've taken away from the story if Eufrates just said "oh thank god" and became good right away. At the end of the day, all the bad things he did were done under his name, and the guilt and trauma from that is not something that can be undone with just the reveal. (SPOILER)

TL;DR: Shoestring Theory is the perfect book for those looking for a cozy read with beautiful prose, witty dialogue and a good, sweet romance, but those who are interested in the enemies to lovers/tragedy aspect might be let down. I give this book 3 stars.

“A queer, madcap, friends-to-lovers-to-enemies-to-lovers time travel romance with the future of the world at stake”

I don’t know where to begin!! I loved this story so much. I was completely charmed by all of the characters and how hard they love (Tig my muscular Queen and Eufie the *misunderstood* bard Prince) but most of all by my sweet, oblivious Cyril. It was easy to relate to his self deprecating and self sacrificing tendencies, as well as his flair for the dramatic and general incompetence in most things. Truly, we need more main characters that are sometimes just stupid!

There is so much complicated love and growth in this story and it was such a joy to read. I don’t care if it sounds lame but it is never too late to learn to love yourself or learn to love the ones around you better!!

Thank you so much @netgalley for the eARC ❤️

Thank you to Net Galley and Angry Robot for the e-ARC.

Shoestring Theory is a fast-paced friends to lovers to enemies to lovers, time travel fantasy book, with so many twists and turns to keep you guessing.

Throughout this book I especially enjoyed the magic system as I felt it was fairly unique: spells being webs of sorts that you can see and can cut/untangle to dispell them. I also really loved the banter between characters - it was witty, hilarious and really showed off how close the main cast are.

This is marketed as perfect for fans of Legends & Lattes, and I definitely agree with that! Whilst not low stakes (or cozy fantasy) the charm the world has and the characters have do play into some aspects of the cozy fantasy genre. Alongside this - mages in this world have familiars which definitely add to that for me (Shoestring and Ganache I love you).

Overall, I definitely would recommend Shoestring Theory for those who love Legends & Lattes, time travel fantasies, and enemies to lovers. Please do take into consideration the below content warnings before picking up this book:
Suicide, knives, self harm, blood, death, murder, attempted murder, abusive marriage, body swap.

As a fanfic girlie, I was intrigued. As a cat lover, it was a need.

I'm always hesitant when there's time travel, but this was SO GOOD.

'Shoestring Theory' is an enchanting time travel romance with a friends-to-lovers-to-enemies-to-lovers arc with both charm and depth. While the plot follows some occasionally predictable patterns (but as a fanfic girlie that's what I am HERE FOR), the rich character dynamics and complex relationships elevate this beyond typical cozy fantasy fare to create an engaging narrative that I was obsessed with and left wanting more. The time travel elements are particularly well-crafted, which is something I am always weary with, and added layers of intrigue to both the romance and the fate of the kingdom. At its heart, there was a perfect balance of lighter moments with weightier themes of redemption and responsibility.

This book was so far from my usual read, and I absolutely adored it.

I was completely enchanted and dying to know where the story was going from the very beginning. It was also sooo cosy and captivating!

This had such a varied combination of tropes and I think that’s what made me love it so much. There’s second chance romance, time travel, magic, wizards, lovers-to-enemies-to-overs, grief, a badass female character.

The cat… that’s my main takeaway from this and I am hung up on the cat more than I care to admit.

I absolutely loved this it was everything I needed.

It was precious, a beautiful and intricate story of second chances and those we love.

I was drawn in from the off, and it really got me in the feels.

The characters are addictive, the pacing of the story is perfect.

I do feel that the mood that I was in at the time of reading made it that much more addictive, it really gave me a lump in my throat on more than one occasion.

I can’t say much more for fear of having to tap the spoilers button.

Just read it. It’s well worth your time ❤️❤️❤️

4.5 stars

TIME TRAVEL COZY FANTASY. Did that sell you, because it got me. Cyril, the former High Mage of the High Court, has been living in isolation with his cat familiar, Shoestring, for years. He fled the court when it became clear that the king he served had become a ruthless dictator, and the realm has been physically falling apart ever since. But when Shoestring does the one thing a familiar never should--dies--Cyril is spurred to action. He sends himself back in time, to a time when 1. Shoestring was alive, obviously, but 2. the king's older sister is about to be crowned instead, before her mysterious death. Now Cyril has a second chance to right his wrongs, if only he can figure out what they were the first time around.

This was such a fun and cozy read with just the right amount of stakes to keep me invested in knowing what would happen next. The magic system was fun and different, but also felt very light and open, like anything could happen, if that makes sense. The rules worked, but weren't restrictive. I enjoyed the romance, but more than anything else the friendship and hijinks were my favorite. It had the feel of fanfiction, where it was very self-indulgent but in the best way. Like a book made up of the side quests you wanted to see fleshed out more in other media. Highly recommend, and thanks to Angry Robot and the author for the advance copy in exchange for my honest review!

The Shoestring Theory has a lot going for it with a clever plot, witty dialogue and various hi jinks involving a cat, The story flows well, and Costa has a strong narrative voice. What brought it down to a three star for me was that the author uses emotional abuse as a plot device. What appears to be a book that carefully discusses the harm done to someone when emotionally abused and coerced, is "fixed" as events unfold. Until this point, the scenes about abuse were well written, and it was such a shame to see such an important topic be essentially thrown out and undermined.

This was a fun romp, but it could have been much better with a bit more care.

This was such a wonderful book and the author has penned it down in such a beautiful manner that reading it was a great experience. The plotline was well paced and executed well too which made my reading experience more wonderful.