Erin is a documentary filmmaker on the brink of a professional breakthrough; Mark a handsome investment banker with a bright future. They seem to have it all. But do they?

On a dream honeymoon to the tropical island of Bora Bora, Mark takes Erin scuba diving. Everything is perfect. Until they find something in the water. Something that will change their lives forever.

Erin and Mark decide to keep their discovery a secret. No one else need know; they trust each other implicitly.

But someone else does know. And in situations like these, it is far better to trust no one, not even those closest to you ...

Set to be the blockbuster read of the summer, this is an unmissable, fast-paced, jaw-dropping thriller from a debut writer destined for great things.