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 caf￿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.

Mick:
I could turn this place into a penthouse. For instance this room. This room could have been the kitchen. Right size, nice window, sun comes in. I'd have I'd have teal-blue, copper and parchment linoleum squares. I'd have those colours re-echoed in the walls. I'd offset the kitchen units with charcoal-grey worktops. Plenty of room for cupboards for the crockery. We'd have a small wall cupboard, a large wall cupboard, a corner wall cupboard with revolving shelves. You shouldn't be short of cupboards. You could put the dining-room across the landing, see? Yes. Venetian blinds on the window, cork floor, cork tiles. You could have an off-white pile linen rug, a table in... in afromosia teak veneer, sideboard with matte black drawers, armchairs in oatmeal tweed, a beech frame settee with a woven sea-grass seat... (sits up) it wouldn't be a flat it'd be a palace.