Fifteen-year-old Iona Dickinson doesn't know she's a witch until she unintentionally makes a deadly wish that reopens a 300-year-old curse on her family and unravels her life. First, Iona narrowly survives a dangerous thunderstorm that claims other lives. She begins seeing ghosts and experiencing premonitions. Her estranged father and grandmother return to reveal the dark secret that her religious mother has kept hidden: Iona is a descendant of the last witch of Blue Willow Grove, and they want her to join the family coven. Iona struggles to explain her emerging gifts and strange behavior to her best friend, MacLaine, and childhood crush, Dyllan. She gains new courage when she meets Sixx, a rebellious girl with a troubled past, and Jules, a mysterious new student who drives a hearse. Torn between conflicting beliefs of family and friends, Iona must risk losing all of them as she chooses her own path.