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
as Capt. David Ross
Sophia Loren
as Stella
Trevor Howard
as Capt. Chris Ford
Bernard Lee
as Cmdr. Wadlow
Oskar Homolka
as Van Dam
Kieron Moore
as Kane
Noel Purcell
as Hotel Clerk
Bryan Forbes
as Weaver
Beatrix Lehmann
as Housekeeper
Rupert Davies
as Baker
Russell Waters
as Sparks
Sidney Vivian
as Grogan
