An engaged couple and the woman's former suitor take shelter in an abandoned house, too late to notice an unexploded bomb. Their retreat is cut off by a cave-in, and they must defuse the bomb with instructions delivered over a phone line.
David Niven
Richard Lilliam
Margaret Sheridan
Janet
John Dehner
Charles Quine
Philip Tonge
Colonel Briggs
Patrick O'Moore
Police Sergeant
Barry Curtis
First Boy
Gregory Marshall
Second Boy
Robin Hughes
Army Sergeant
Anthony Marsh
Army Corporal
Vernon Downing
Father