That Woman Opposite (1957)

That Woman Opposite (1957)
(info from Imdb)

A series of daring robberies has taken place on Rue des Anges, a quiet street in the town of La Bandelette. Standing by an open window in his study, Sir Maurice Lawes sees a gendarme beaten to death and the killer, who also sees Lawes, escape in a car. The next evening, the residents hear a shattering scream from Janice Lawes when she finds her father murdered.
Director: Compton Bennett
Writers: Compton Bennett (screenplay), John Dickson Carr (novel "The Emperor's Snuffbox")
Stars: Phyllis Kirk, Dan O'Herlihy, Wilfrid Hyde-White