House of Mortal Sin
House of Mortal Sin (also known as The Confessional and The Confessional Murders) is a low-budget 1976 British horror film directed by Pete Walker. It was scripted by David McGillivray from a story by Walker. Its plot concerns a deranged priest who takes it upon himself to punish his parishioners for their moral transgressions. Plot. Hearing that her friend Bernard has become a Catholic priest, Jenny attends church to seek him out but finds that the man taking confession is not Bernard, but the elderly Father Meldrum. She quickly leaves, but not before telling Meldrum  that her on-off boyfriend Terry recently pressured her into having an abortion. Outwardly a kind-hearted counsellor of troubled youth, Meldrum is in fact a fervent believer in "divine justice" who freely resorts to emotional abuse in his obsessive efforts to redeem those he views as sinners. That night, while Jenny is out, Meldrum gains entry to her flat and assaults her friend Robert, believing him to be Terry. The unconscious Robert is taken to hospital. The next day, Meldrum invites Jenny over to his presbytery, which he shares with his frail, bed-bound mother and his housekeeper, Miss  Brabazon. During the meeting, Jenny is shocked to discover that Meldrum taped her confession to blackmail her. When she tells Terry of Meldrum's actions, Terry tracks Meldrum down and threatens him, but Meldrum bludgeons Terry to death with an incense burner and buries him in a freshly dug grave in the churchyard. Later, he quietly murders Robert in hospital. At first refusing to believe Jenny's claims about Meldrum, Jenny's sister Vanessa learns the truth when she answers a threatening phone call from the priest on Jenny's behalf. She goes to the presbytery and encounters Mrs Meldrum , who knows that her son is mad and begs Vanessa to help. Meldrum arrives, strangles Vanessa, and at Brabazon's urging, murders his mother on the pretext of a mercy killing. Brabazon consoles Meldrum and says that she has always loved him, even though his mother forced him to call off their wedding and embrace a life of celibacy by entering the church. The pair make a suicide pact so that they can be together for ever, but after Brabazon fatally stabs herself, Meldrum hesitates. Bernard discovers the bodies of Terry and Vanessa and confronts Meldrum, who claims that Brabazon  committed the murders out of love for him. He persuades Bernard to help him cover up the crimes for the good of the church. After Bernard leaves, Meldrum silent-calls Jenny to check that she is at home, then puts on a cloak and steps out into the night.