Brimstone and Treacle

Tom Bates (Denholm Elliott) and his wife, Norma (Joan Plowright), are initially overjoyed when a mysterious stranger named Martin (Sting) inserts himself into their lives, proving an enormous help with their domestic chores. They are especially pleased when he takes an interest in their disabled daughter, becoming her de facto caretaker. Gradually, however, they realize that he's not who he seems -- and Martin reveals himself to be a diabolical presence.