Gracelyn Adams just thought she was depressed. After months of feeling blue, losing her friends one by one, she is at her wits' end, dealing with the nonstop soul-crushing despair she feels every day. Even though, she knows there is nothing at all to feel sad about. Her job is going well, her life is on track, but things go from bad to worse when she begins having 'episodes' at night. Then he shows up. Inside her bedroom, in her locked apartment, on the twelfth floor. Has Gracelyn gone completely off the deep end? Or does this stranger hold all the answers to unlock this prison of sadness she's been living in?