Reclusive, mysterious author Ginevra Ex is famous for her unusual approach to crafting her big bestselling thrillers: she hires real people and conducts intensive interviews, then fictionalizes them. Her latest main character, Rory, is thrilled when Ginevra presents her with an extravagant bonus—a lavish trip along Italy's Mediterranean coast on the famed, newly renovated Orient Express. But when Rory boards the train, she's stunned to discover that her brother, her best friend, and even her ex-fiancé are passengers, as well. All invited by Ginevra, all hiding secrets.

With each stop, from Cinque Terre to Rome to Positano, it becomes increasingly clear that Ginevra has masterminded the ultimate real life twisty plot with Rory as her main character. And as Ginevra's deceptions mount, and the lies and machinations of Rory's travel companions pile up, Rory begins to fear that her trip will culminate like one of Ginevra's books: with a murder or two. In the opulent compartments of the iconic train, Rory must untangle the shocking reasons why Ginevra wanted them all aboard—and to what deadly end.