1.When Nina’s husband Rendell was murdered by his own student Sam lesser, She moved with her family from Seattle to Matheson.
2.Nina with her three children, Tyler, Kinsey, and Bode moved to Rendell's family home, Keyhouse.
3.Throughout the house, children discovered a number of mysterious keys, that can be used to unlock various doors in magical ways.
4.Children soon become aware of a demons that were also searching the keys for malevolent purposes.