This was an amazing book, full of action and plot twists! I read the rest of the series that is out right now, and that was amazing too. I definitely recommend this book.

This is probably one of the best books that I've ever read, and I've read a lot of books! The author wrote it in a great style and I love how the action scenes are and the amount of them. Charlie Thorne is an amazing character and so are really ALL the other ones. It also has an amazing plot. So PPPLLLEEEAAASSSEEE read this book!

This book was amazing. At first I thought it was going to be too much science stuff but it wasn't!! If you like mysteries and action this is right up your alley!!! This is the first book in the series and the other books are just as good!!!

It was okay. I wouldn't read it again.

I really like this book. When I read I couldn't wait to see what happened next. I am now excited to read more books from the author Stuart Gibbs.