Lisa, a troubled young woman with a past, finds a beautiful room to rent in a house in North London. After moving in, she finds a suicide note hidden in her room. Her landlords insist the note's author doesn't exist, and that Lisa is their first tenant. Lisa begins to doubt herself. Compelled to uncover the secrets of the man who lived in the room before her, Lisa grows alarmed by increasingly disturbing incidents. As she claws her way towards the truth, she descends into a psychological hell where she's not sure what's real and what's not.