Stuart Gibbs is one author that I try to find each of his books for my classroom. His series bring so much joy to my students. I enjoyed reading Charlie Thorne and the Lost City because I'm a total mystery nerd and the adventure pushed it over the edge.

My word for this sequel would be fun! This is a series I would have gobbled up as a child and did gobble up as an adult. Love the puzzles and the hunt, plus the character development for Charlie.

Stuart Gibbs doesn't disappoint with this new adventure series. Our students can't put down anything he writes.

Charlie Thorne returns as a force to be reckoned with as she navigates the South American jungle in search of the secrets hidden by Charles Darwin on his famous voyage of exploration. Pursued by international cut-throats who will do anything to succeed, Charlie is joined by operatives from the CIA and FBI as they race to uncover Daewin's dangerous secret. Filled with fast-paced adventure and clever characters, this second Charlie Thorne adventure is a page turner.

I read Charlie Thorne and the Last Equation and thought it was fantastic, so when I saw a second book, I knew I had to read it as well. These books are action-packed adventures with lots of history and science woven into them as well. In this second book of the series, Charlie is attempting to hide out in the Galapagos Islands when she is asked to help decipher a coded message apparently carved into the lower shell of a Galapagos tortoise by Charles Darwin. Thus begins the dangerous race across South America and into the heart of the Amazon rainforest to find the treasure Darwin discovered and then never talked about once back in Europe. Charlie is incredibly smart, and the dynamic between her, her half-brother Dante, and his CIA partner Milana is great.

I appreciated that Stuart Gibbs included an author's note at the end of this book to clarify the aspects of the story that were true about Darwin and those that were pure fiction. These books do include some violence, so I would classify them towards the upper end of middle grade. I will absolutely be adding this series to my middle school class library.

With the Pandora code safely stored in her genius brain, Charlie is hiding out on an island in the Galapagos chain. Powerful people from powerful governments are actively searching for her, including her half-brother, Dante who is a CIA agent. Charlie is found by a scientist from one of the neighboring island's tortoise sanctuaries who had found a cipher carved on one of the tortoise's shells. The cipher was believed to be from Charles Darwin and was the first clue in leading Charlie to 'the world's greatest treasure' as discovered by Darwin. The subsequent clues led Charlie, Dante and Milana deep into the Amazon rain forest, followed by several teams of 'bad guys" eager to get their hands on the treasure, too.

I am a huge Stuart Gibbs fan, and this newest series to his line-up does not disappoint. Charlie is a very bright and precocious 12-year-old who reminds me of Sherlock Holmes in how quickly she can decipher clues. The action and adventure in the Charlie Thorne books keeps the pages turning quickly and I find myself flying through the books to see what happens.

This second book was just as good, if not better than the first Charlie Thorne book. The descriptions and details about the Amazon rainforest show Gibbs clearly does his homework in order to create a setting that opens a new world to his readers. The endnotes are also very informative regarding the research he did in regard to Darwin and his studies and theories. I was surprised to see the topic of evolution broached in a middle grade children's book and was wondering how he was going to pull it off without immediately throwing this book on a challenged books list, but the author's notes also clearly indicate which parts of his books are based on information from primary source documents and what is derived from the author's creative license. This book inspired me to not only look up images an information on the Amazon, but to skim other resources and sites about Darwin and his studies as well. That, in itself, is the mark a of a great author: one who inspires readers to wonder and research more.

Again, I liked this book better than the first one (which was great!) and the teaser at the end that Charlie's next trip would be following Cleopatra's clues to Egypt makes me eager for the next Charlie Thorne book. Stuart, if you're out there - write fast!

This book is the sequel to Stuart Gibbs’ Charlie Thorne and the Last Equation, and it continues to divulge the adventures of the fascinating -if slightly disputatious- characters. If you’ve read the first Charlie Throne book, you’re likely already dying to read this one, and if you haven’t, I highly recommend doing so.

Although this book had quite a bit of talk of evolution, which I personally did not appreciate, it was not written as a persuasive piece, and it was not hard to just think of it as a fictitious part of the book.
I’m giving this book a four star review because even though I didn’t agree with everything in the book, I did enjoy the different perspective and I found it to be an engaging and enjoyable adventure.

We received a complimentary copy of this book from NetGalley.

I loved this book just as much as I love the first one. This is my favorite Stuart Gibbs series so far. I have recommended it to kids repeatedly. And I feel like if kids come through my library program and don’t know about Stuart Gibbs that means I haven’t done my job. Needless to say, I’m a fan. And this series is his best.

I love Charlie. She’s got so much personality and so much independence. I love the dynamics between her and her brother. I love the traveling. It makes me feel like I’m not sitting at home.

Charlie Thorne had saved the world and planned to relax on the Galapagos Islands. Esmeralda Castle tempts her with a code that will reveal the secret of the treasure Charles Darwin found two hundred years ago that terrified his crew. She's not the only one after the treasure, and she has to get there first to protect it from those who would abuse it.

This is a sequel to Charlie Thorne and the Lost Equation. All you really need to know is that she's a brilliant teenage fugitive, excellent at codebreaking and math. I hadn't read that book first, and I didn't miss anything diving headfirst into this one. She doesn't trust anyone, so she constantly is on the alert for danger and has contingency plans to escape. That's not only a sign of a girl on the run, she's traumatized as well. With the resiliency of childhood, she doesn't see it the same way that I do. When she meets up with her half-brother Dante, she doesn't trust him, either. That's just sad, because the average twelve-year-old should be hanging out with friends, watching music videos, and playing video games, not going on the run internationally. Then again, if she was an ordinary twelve-year-old girl, we wouldn't have a book series.

Charlie is one of those geniuses that knows everything, has a nearly photographic memory, and spends her free time reading and learning about random things. This means she pulls out facts left and right as she's presented with new things, and her skill as a codebreaker is kind of what got her into the mess of this book. She also can't help but want to know things, which is why she doesn't cut and run when it gets hard. Esmeralda isn't who she said she was, Russians are after her, and the CIA would rather see her protected in their custody. In the middle of this chase are thrilling scenes that would be fantastic in a thriller movie. We have car/bicycle chases, speedboats, shooting from airplanes, massive explosions, and a lost city containing the secret that Darwin hid from the world.

I really enjoyed this book and devoured it in a single day. While there were times I thought Charlie was a big smug and irritating, she's also a twelve-year-old girl. They naturally have their moments where they think they know everything. In this case, Charlie really does. But she's also outnumbered, outmanned, and has to think on her feet. I really like that about her, and that she learns from the mistakes that she makes. I look forward to seeing more of her adventures!

The second installment of twelve year old genius Charlie Thorne has her hiding out in the Galapagos. When her cover is blown, she finds herself pursued by an Italian family, the KGB, the CIA and the guys who work in a refinery. Some want the Einstein's Pandora Equation, which was his final equation and supposedly could solve the world's energy problems. Charlie has the only copy stored in her brain. Others want the treasure Darwin allegedly found during his long trip to South America, and the refinery guys don't know what they are chasing but their leader thinks it must be valuable. Multidisciplinary with insights into the history and ecosystem of the Amazon Basin. The exchanges between Charlie and her half brother Dante offer a bit of levity to the situation as Dante tries to keep up with the knowledge in Charlie's photographic memory. It's a historical and a mystery, but it packs a punch in the adventure category. Now I want to read the first one, The Lost Equation. Highly recommended.

This series is great; I loved the first book and this, and can't wait for the third. Strong characters, intriguing plots and great that it goes back to historical figures.

Charlie Thorne, the young genius, is on a new adventure. I thoroughly enjoyed this book. Fun and adventurous the book was a fast read.

Charlie Thorne, twelve-year-old genius, now has the only copy of the world's most dangerous formula locked in her brain. To keep it safe from those who would misuse it (which is everyone), she hides out on the remote Galapagos Islands. This puts her right on the spot when scientists at a nearby research facility uncover a clue to Darwin's greatest discovery. The hunt for Darwin's secret and Charlie herself includes a plethora of characters with questionable motives: a scientist, a Russian spy, her CIA agent brother and his partner. Death-defying feats, code-breaking, and peril amid the lush South American landscape make for a thrilling read.

I really enjoyed the first Charlie Thorne, and this was a solid sequel. I also think this book did a lot better at setting up the rest of the series than the first book did. We now know what we can expect from a third book without a major cliffhanger. I didn't like how stretched out the action sequences were, but they were very detailed and easy to picture which you don't get with every action-y novel.

This is the second book in a series but you can easily read this middle grade adventure without reading the first book - but you will want to go read the first book. Charlie Thorne is an adventure seeking ,adrenaline filled twelve year old with a brilliant brain and a talent for puzzle solving. She gets pulled into working with the CIA (and her brother) to solve a clue found on a tortoise shell possibly written by Charles Darwin that may lead to an unknown treasure. The story is chock full of puzzles, math problems as well as science and history. It will appeal to the armchair adventurer in all of us and Charlie is the perfect mentor for girls who excel in math and science. She is tough, she is smart and she knows what she wants. The nonstop action will appeal to all readers. This is another example of the smart and funny books of Stuart Gibbs and his fans will flock to this series as well. My thanks to the publisher for the advance copy.

I have enjoyed Stuart Gibbs’ books since I discovered his Three Musketeers series. Charlie is a genius (obviously) but she is also very creative. For this the credit must go to the author, though. The story is fast with just a mildly gruesome scene. The banter between Charlie and Dante is spot on for siblings. I will be exciTed to share this second book with my students.

Love everything about this story. Charlie Thorne is fun, intelligent and adventurous. The story moves quickly and will easily hold the interest of any middle schooler. Once again Stuart Gibbs has intertwined adventure, science and a bit of social justice and created a fabulous read

Wow! This book was an adventure!
Charlie Thorne is surfing in the Galapagos when she discovers another puzzle to solve- this one left by Charles Darwin.
This middle grade novel was a page turner for sure. I can't wait to see what Charlie gets up to next!
Thanks to Netgalley and Simon & Schuster books for young readers for a chance to read the ARC.

I received an ARC of this title from NetGalley in exchange for an honest review. All opinions are my own and were not affected by the free copy.

Charlie Thorne has escaped the CIA and made it to the Galapagos Islands, spending her days surfing and reading. Until one day, Esmerelda Castle appears on her front door, telling Charlie that Charles Darwin also left a mysterious clue to a scientific discovery behind.

I love this series. We have a strong, smart female character with an interest in math and science-everything we need for middle grade girls! But she is not a girly girl and the mystery and action will appeal to boys as well. I'm a little bothered by the fact that this 12-year old girl basically vanished from the face of the Earth and no one questions it? We already knew this from the first book, but her parents are terrible people.

I identified with Charlie so much in this book. Not because I'm a genius or anything, but because she is so aware of the fact that as a general rule, the human race cannot be trusted with important things. We (the human we) will exploit things for our own gain, every single time. I loved the little bits of history and science that the author snuck in. Almost like he's tricking people into learning. ;)

This book is perfect for middle grade readers. I can't wait for the next book.

A great continuation of the Charlie Throne series. It was fast-paced and exciting. Can't wait for book 3.