Aston (Robert Shaw), a quiet, reserved man, lives alone in a top-floor cluttered room of a small abandoned house in a poor London district. He befriends and takes in Mac Davies (Donald Pleasence), an old derelict who has been fired from a menial job in a café. In time Aston offers him a job as caretaker of the house. Aston's brother, Mick (Alan Bates) - a taunting, quasi-sadist - harasses the derelict when his brother is away, countermanding his orders. Eventually Aston, himself irritated by the cantankerous old man, puts him out.
Assigned by the professor, 5 senior university students were invited to the old mansion belongs to ML.Salukjit, an old elite who welcomes them with her weird attitude. Before the decision to leave or stay has been made, ML.Salukjit terrifies them and reveals her demonic power.