Six months ago, Natalie's sister Kit went to Wisewood, a retreat on a secluded Maine island. 

Today, Natalie receives a message: 

Would you like to come tell your sister what you did - or should we? 

Natalie has no choice: head to Wisewood. Rescue her younger sister. Confess the secret she's been 

keeping. Stop everything unravelling. 

But there's one thing she hasn't considered. 

While getting on the island is difficult, getting off might be impossible . . .