Aude Vanier is a sixteen-year-old rock star with a problem—stone monsters keep attacking her. And when they do, she finds herself chanting in a language she doesn't understand. Guillaume de Rouen has been stuck as a gargoyle on a church for the last seventy years, until Aude's chanting releases him back to his seventeen-year-old human form. An ancient Iroquois prophecy about the destruction of Montreal is coming true. Together, Aude and Guillaume can stop it. But Aude is the descendant of a centuries-old coven of witches—a coven that Guillaume failed to protect seventy years ago. This time, if they fail, the world will never be the same.