When a woman's body is found submerged in icy water, police are shocked to find she is alive. But she won't disclose her name, or what happened to her - even when a second body is discovered. And then she disappears from her hospital bed. Detectives Adrian Miles and Imogen Grey follow their only lead to the home of the Corrigans, looking for answers. But the more they dig into the couple's lives, the less they understand about them. What's their connection to the body in the river? Why have other people they know been hurt, or vanished? And can they discover the dark truth of their marriage before it's too late?