From the New York Times bestselling author of The Physick Book of Deliverance Dane comes a chilling mysteryPrep meets The Crucible. Its senior year at St. Joans Academy, and school is a pressure cooker. College applications, the battle for valedictorian, deciphering boys texts: Through it all, Colleen Rowley and her friends are expected to keep it together. Until they cant.First its the schools queen bee, Clara Rutherford, who suddenly falls into uncontrollable tics in the middle of class. Her mystery illness quickly spreads to her closest clique of friends, then more students and symptoms follow: seizures, hair loss, violent coughing fits. St. Joans buzzes with rumor; rumor blossoms into full-blown panic.Soon the media descends on Danvers, Massachusetts, as everyone scrambles to find something, or someone, to blame. Pollution? Stress? Or are the girls faking? Only Colleenwhos been reading The Crucible for extra creditcomes to realize what nobody else has: Danvers was once Salem Village, where another group of girls suffered from a similarly bizarre epidemic three centuries ago…Inspired by true eventsfrom seventeenth-century colonial life to the halls of a modern-day high schoolConversion casts a spell. With her signature wit and passion, New York Times bestselling author Katherine Howe delivers an exciting and suspenseful novel, a chilling mystery that raises the question, whats really happening to the girls at St. Joans?