I Did Warn Her

A superyacht becomes a crime scene in this diverting thriller from Gilbert (She Started It). Former nurse Sasha has taken a new job on Ophelia, a massive ship chartered for a journey from Gibraltar to New York City by wealthy friends Benjamin Edmonson and Digby Johnson. After the crew is assembled, Sasha—who’s withholding the reason she changed careers—notices that the yacht’s four other stewardesses look almost exactly like her: “Put us in a lineup and turn us around, and I’m not sure our own mothers could tell us apart.” Then Sasha learns that one of her predecessors vanished a year prior, and that the girl’s best friend suspected foul play. Gilbert alternates perspectives among Sasha; her supervisor, Jade; and her lookalikes, gradually sowing doubt about the purpose of the journey. Meanwhile, an eerie prologue featuring a female corpse floating in the water hangs over the action, suggesting that someone on the ship is a killer. Gilbert has the mechanics of the locked-room mystery down, and orchestrates the story’s familiar parts into a satisfying symphony of tension. It’s tough to put down. Agent: Helen Heller, Helen Heller Agency. (June)