The Ruffian on the Stair (1973)

Joyce (Judy Cornwell), a fragile former prostitute, lives a life of quiet desperation with her "husband" Mike (Michael Bryant), a thuggish, zealously Catholic hitman who uses his van for "irregular contracts." Their stagnant domesticity is shattered by the arrival of Wilson (Billy Hamon), a menacingly polite young man who has his own motives for visiting...