Eight years after a virus has left half of the population of the world mentally unstable, a man named Ethan Chase enters into a program to become a ‘Sitter’ or caretaker to two unstables. One of which, is a girl, a ‘Mirror,’ who believes that she leaves for Paris every Sunday and returns on Tuesday and often mimics and repeats the actions of those around her. The other, a highly functioning ‘Amnesiac’ named Noah who is at one moment lucid and the next completely incoherent. As Ethan develops an unlikely, and looked down upon, friendship with his two cases–he begins to realize that line between being normal and abnormal are not that different as he is swept up in events far beyond his control.