The Sanctuary meets Shutter Island in this high-concept psychological thriller from Katherine Bradley, critically acclaimed author of The Sisterhood.

WHAT HAPPENS WHEN YOU CAN NO LONGER TRUST YOURSELF?

Billie wakes alone on a psychiatric ward.  She’s told she’s the lone survivor of a tragic group suicide.  But she knows she didn’t choose to step in front of the train.  So why did her mind tell her to do it?

WHAT HAPPENS WHEN YOU CAN NO LONGER TRUST OTHERS?

Desperate for answers, Billie agrees to sign herself into the care of the Arbor Institute, a mysterious, corporate-backed research body investigating a disturbing rise in similar incidents around the globe.

WHAT HAPPENS WHEN OTHERS NO LONGER TRUST YOU?

Isolated within the Institute, Billie learns more about ‘flock phenomena’, where people band together to self-destruct. She is told that she’s at risk of ‘re-flocking’, and if she does, she will likely die.

But not everything is as it seems. When Billie discovers that she and her fellow survivors have been completely cut off from the outside world, she realizes they may not be safe.

The Institute really should have been more careful about taking her under their wing.

Because this wounded fledgling might turn out to be a bird of prey.