Colder (The Tamelin Light) by Alexander Bryant.
Talitha Tamelin is pondering what to do about her otherwise brilliant sister, Annelli, who worships a million-year-old cosmic monster. The two women are the last remaining members of an old line of ancestors who claimed to possess supernatural powers and speak with ancient gods. It’s all nonsense to Talitha – until the FBI designates her a person of interest in an especially strange investigation. According to them, she and her sister could be the next victims in a worldwide crisis, where the brightest people in their fields are simply vanishing.
Really good read. I liked the story. 4*.

I found this book very difficult to read and follow the story. It had interesting bits but it seems to be all over the place in plot. Even after it is done I am not quite sure about what was going on. I preferred the last third as it seemed to have better pacing and more interesting story. There are parts that never were resolved. Almost seemed like two books that are connected.

As I started write this review I took a look at the Amazon review Tim Vaderr posted on 11 April 2018. Mr. Vaderr has read earlier versions of this story and says that this is much better than those. Well my summary reading note is "Why are we reading this nonsense?" and I suggest that Mr. Vaderr is being too gentle, the book is still a mess.

Not my cup of tea but interesting. I can see readers of Neil Gaimon enjoying this. Kind of mythos, imaginary, Mulder sort of read.

This book was a bit of a departure from my usual reading, as there were not a lot of details available for it. However, it does make for an exciting read. I would think it is more YA than anything else. The 2 sisters, Annelli and Tabitha, are destined to serve under mythical monsters from an invisible world. Recommended.