After a night of revelry, Ava returns home after being abandoned by her friends, only to discover that she is already in bed. However, the person in bed isn’t her—it’s a doppelgänger. A fugitive from the future has taken over Ava’s body, identity, and life. To complicate matters, this imposter isn’t alone. There are others like her, hiding in the past, living among us in secret, and scheming to change the future. Stripped of her physical form, Ava becomes a ghostly presence, unseen and unheard by the world. As far as she knows, she is the only one capable of stopping them and restoring the timeline.