After a young woman turns up dead after a party thrown by her new boss, the initial investigation of Naomi Lockhart's murder points to Joseph Madden, the owner of a coffee shop around the corner from police headquarters. Madden insists he's innocent, that he was home with his wife Rachel at the time of the murder. When police question her, Rachel contradicts his alibi, swearing that she was home alone. Detective Constable Cat Kinsella knows that one of them is lying - but the question of which one, and why, is far more complicated than she could have expected.