Cocooned from the world on a luxury cruise, nothing can interrupt forensic physician Dr Anya Crichton's time with her precious six-year-old son.The break Anya needs is shattered when the dripping wet body of a teenage girl is discovered in a cupboard. 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. 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.