A wealthy businesswoman disappears from her Glasgow home without a trace, leaving her husband and children panicked but strangely resistant to questioning. Tracing the woman's cell phone, detective Alex Morrow discovers a call made from an unlikely location. A sleepy seaside community where everyone knows everyone, Helensburgh is the last place you'd go looking for violence. But Morrow's investigation uncovers increasingly disturbing clues: fierce family battles that go back generations, a suspicious insurance firm, and finally, a dead body in a nearby lake. And when a connection to someone close to Morrow surfaces, the case gets more wrenchingly personal than she could have imagined.