A powerful family. A luxury cruise. A dark secret.

The Scarmados are the most famous family in Britain, notorious for throwing lavish parties funded by their media and shipping empire. Now, head of the family Mattia is about to retire, and he's taken his four children and his new young wife Belle on the maiden voyage of one of his luxury cruise ships. The tabloids are buzzing: is he about to announce his successor?

Belle has insisted her best friend Emily joins the party. She needs an ally against her feuding stepchildren. But from the moment they arrive on the ship, sinister things start to happen. Mattia's eldest son disappears. His second son falls ill. His daughter's business is sabotaged. And, looming over it all, is the question that makes Emily fear desperately for Belle. What really happened to Mattia's first wife three years ago?