On the morning of the first day of senior year, Alix Keener awakens from a vivid, terrifying dream in which a ghostly boy warns her: Perennial is all around you. Alix does not need the dream and the cryptic message as she starts a new life in Beaconsfield, the posh Detroit suburb she and her dad recently moved to after her moms death. Alix manages to ignore the mysterious message until one of her new classmates, the alluring Lewis Wilde, mentions it. He knows something about Perennial, and hints that it has to do with a boy who died in Alix's bedroom. Suddenly wracked by waking visions, Alix finds herself teaming up with Lewis to uncover the truth.