There is a right way and a wrong way to summon her. Jess had done the research. Success requires precision: a dark room, a mirror, a candle, salt, and four teenage girls. Each of them—Jess, Shauna, Kitty, and Anna—must link hands, follow the rules . . . and never let go. A thrilling fear spins around the room the first time Jess calls her name: "Bloody Mary. Bloody Mary. BLOODY MARY." A ripple of terror follows when a shadowy silhouette emerges through the fog, a specter trapped behind the mirror. Once is not enough, though—at least not for Jess. Mary is called again. And again. But when their summoning circle is broken, Bloody Mary slips through the glass with a taste for revenge on her lips. As the girls struggle to escape Mary's wrath, loyalties are questioned, friendships are torn apart, and lives are forever altered. A haunting trail of clues leads Shauna on a desperate search to uncover the legacy of Mary Worth. What she finds will change everything, but will it be enough to stop Mary—and Jess—before it's too late?