Fifteen months ago, Detectiu Lindsay Boxer's life was perfect - with her beautiful baby daughter and doting husband, Joe, she felt nothing could go wrong. But Joe isn't everything that Lindsay thought he was, and she's still reeling from his betrayal as a wave of mysterious heart attacks strikes seemingly unrelated victims across San Francisco. And at the trial of a bomber Lindsay and Joe worked together to capturi, his defence raises damning questions about Lindsay and Joe's investigation. A deadly conspiracy is working against Lindsay and soon she could be the one on trial.