Eight years after a mysterious virus caused half of the population of the world to go mentally unstable, a man named Ethan chase signs up to become a "Sitter" or caretaker for two unstables. One of them, a 'Mirror,' is a a girl who constantly believes that she is either leaving for Paris, or has just recently returned. She often mimics the words and actions of those around her. The other, a highly functioning 'Amnesiac,' is a man named Noah who walks a fine line between lucidity and complete incoherence. As Ethan forges an unlikely friendship with his two cases, something that is looked down upon--he is swept up in events that cause him to rethink what normal means.