In a series of online posts, Parker H., a young psychiatrist, chronicles the harrowing account of his time working at a dreary mental hospital in New England. Through this internet message board, Parker hopes to communicate with the world his effort to cure one bewildering patient --- a 40-year-old man who was originally admitted to the hospital at age six. This patient has no known diagnosis, and his symptoms seem to evolve over time. Every person who has attempted to treat him has been driven to madness or suicide. Parker takes it upon himself to discover what ails this mystery patient and finally cure him. Facing a possibility beyond his wildest imaginings, Parker is forced to question everything he thought he knew.