[7] Sylvia Sidney and Oskar Homolka star in this Alfred Hitchcock suspense yarn about a movie theater owner (Homolka) who is conspiring to set off a bomb in London. While a Scotland Yard detective (John Loder) tries to identify and arrest the saboteur, the destructive plan comes to a head when Homolka sends Sidney’s unwitting young brother (Desmond Tester) to the predetermined location… with bomb …