Forensic physician Dr Anya Crichton needs a break. Cocooned from the world aboard a luxury cruise ship, nothing can interrupt time with her precious six year old son.

Peace is shattered when the body of a teenage girl is discovered shoved in a cupboard, dripping wet. With no obvious cause of death and the nearest port days away, Anya volunteers her forensic expertise.

She quickly uncovers a sordid pattern of sexual assaults, unchecked drug use and mysterious disappearances. With crew too afraid to talk, she is drawn into the underbelly of the cruise line, its dangerous secrets and the murky waters of legal accountability.

Shadowed by a head of security with questionable loyalties, Anya can trust no one. Her family's lives depend on what she does next.

One thing is certain. There is a killer on board.