This book was not what I expected but I enjoyed it. I love the isolated setting trope and the sinister island was perfect for this. 

Following Thea who is taking part in what she thinks is a sleep study to cure her insomnia this book takes a turn for the dangerous and gruesome. 

There was a lot of graphic depictions of violence in this book but the twist was unexpected and brilliant. 

Thank you to Netgalley and the publisher for a copy of this book in exchange for my honest review.