Nathan Kappas, newly promoted to second engineer on the cruise ship Sapphire, has eyes only for the vessel he’s about to board. He literally runs into Harper Quade, a singer and dancer hired to entertain passengers. Harper has always wanted to travel, and working onboard the Sapphire keeps him away from his abusive ex-boyfriend. As they sail to Hawaii, Tahiti, and other exotic destinations, Nathan and Harper soon share a cabin and a deepening connection, which surprises Nathan, who generally prefers the predictability of machines to people. But an employee who feels jilted when Harper gets promoted harasses him, and Harper’s dangerous past refuses to let him escape. Harper might not be as safe on the Sapphire as he assumed, but Nathan will do anything to protect him.