DI Zoe Dolan is tracking a stalker who brutally attacks women in their own homes. With no idea how he gets in, or who he'll target next, the case is at a dead end - until a tip-off from a confidential helpline.

But the new information drags Zoe deeper into the darkness. As the psyche of a vicious criminal threatens to drown her, the traumas of her past creep ever closer.

Now, for Zoe and the other women of the city, nowhere is safe. Particularly their own bedroom in the dead of night . . .