A British naval officer has a brief affair with a woman in England and never knows that she bears him a son. 20 years later the boy is on a ship under his command when he is tracking a German Raider. When the boy is captured after his ship is sunk, he finds a way to slow the German's progress while a lethal hunt for him goes on.
Jeffrey Hunter
as Signalman Andrew 'Canada' Brown
Michael Rennie
as Lt. Richard Saville
Wendy Hiller
as Lucinda Bentley
Bernard Lee
as Petty Officer 'Stokes' Wheatley
Victor Maddern
as Signalman Willy Earnshaw
John Horsley
as Commander John Willis
Patrick Barr
as Captain Tom Ashley, HMS Amesbury
Robin Bailey
as Lieutenant John Stafford, HMS Stratford
James Drake
as Navigator (uncredited)
