 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 (Wilfred Hyde White) 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 (Petula Clark) when she finds her father murdered. Chief Inspector Garon (Guido Lorraine) of the French police and private investigator Dermot Kinross (Dan O Herlily) are puzzled as to who would find to kill the kindly Lawes; was it divorcee Eve Atwood (Phyllis Kirk) whose bloodstained nightdress had been found by the police; or the son of the house, Toby (Jack Watling), who had been secretly robbing his father to close the lips of his blackmailing mistress; or a case of robbery with violence, as a valuable necklace had been stolen from Sir Maurice s famous collection; or the burglar who feared Sir Maurice had seen him kill the gendarme?