Rachel wakes from a coma to discover her controlling husband has been killed, and the police suspect her of involvement. But all Rachel can recall from the last few weeks are tantalising flashes of a fellow commuter. A man whose name she doesn't know. A man who has disappeared without a trace. Now Rachel is a wealthy widow and the vultures are circling, wanting her in prison for murder, or failing that - dead. Can Rachel discover the truth in time to save herself?