In wartime England, circa 1941, poorly-armed tugs are sent into "U-Boat Alley" to rescue damaged Allied ships. An American named David Ross arrives to captain one of these tugs. He's given a key by a fellow tugboat-man -- a key to an apartment and its pretty female resident. Should something happen to the friend, Ross can use the key.
William Holden
Sophia Loren
Trevor Howard
Bernard Lee
Oskar Homolka
Kieron Moore
Noel Purcell
Bryan Forbes
Beatrix Lehmann
Rupert Davies
Russell Waters
Sidney Vivian
Irene Handl
John Crawford
Jameson Clark
Guy Standeven
Keith Faulkner
Michael Caine
Bart Allison
Belita
Pauline Chamberlain
Keith Faulkner
Renée Houston
Aileen Lewis
Richard Neller
Ernie Rice
Robert Rietti
John Tatham
Reg Thomason