Cass Lynch is shocked to discover that the new third officer for her latest voyage through the Shetland Isles is a man she thought had drowned years ago. She also has an odd feeling about some of the new trainees and as her distrust deepens, people go missing and another is found dead. Cass must out-manoeuvre the killer - or become the next victim.

Readying her Norwegian sail-training ship, Sorlandet, for a fresh voyage through the Shetland Islands, Cass Lynch has the shock of her life when the new third officer is a ghost from her past - the man she thought she'd left to drown in the Atlantic eleven years before.

Cass has an odd feeling about some of the new trainees: a slick city-boy, and a brother and sister. As her distrust of the newcomers deepens, two people go missing and a third is found dead. Struggling to confront the ghosts of her past, the deceased of her present, and the man of her future, Cass must out-manoeuvre the killer before she too becomes one of the victims.