Katie found a job as a housekeeper at night, which paid well, earning 88 pounds a night.However, the castle she looks after is full of mystery and eerie atmosphere.

When she arrived at the castle, the first thing she felt was the cold temperature, which seemed to penetrate the bone marrow.Looking around, the walls are covered with paintings, but every painting is full of horror and makes people shudder.

Tabitha, the hostess of the castle, and her brother Hockett told her that they would attend a banquet tonight, and her task was to take care of their other brother Andras.Andras was disabled and was placed on the top floor.

Katie felt a little uneasy when Hockett told Katie that there was no cell phone signal near the castle and could only be contacted by landline.She wanted to go upstairs to see Andras, but was refused.Later, Tabitha shows her Andras' food and reminds her that there is a bell next to her bed that, even though it never rings, is worth paying attention to.

After Tabitha and Hockett leave, Katie's friend Hill unexpectedly arrives at the castle.Katie told Hill about her uneasiness, even mentioning the stuffed cat she had just seen.However, when they went to look for the cat, they found a live cat.Katie became increasingly frightened and wanted to leave, but the landline phone number would not work.

At this moment, the bell upstairs that had never sounded suddenly rang.Katie and Hill decided to go upstairs and check it out.They arrived at Andras' room, only to find him tied to the bed and his mouth covered.Katie wants to free Andras, but Hill tells her that a tied person cannot ring the bell.

At this time, Tabitha and Hockett return to the castle and reveal the secret that Andras is possessed by the demon Castiel.They tell Katie they've been keeping the devil tied up in this room for half a century.