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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.