During World War I, the British navy disguised some of its warships as civilian cargo ships, known as Q Ships, in order to fool the Germans. German U-boat commander Capt. Von Haag spots one of these ships, commanded by Adm. Sims, in the English Channel and begins tracking it, leading to a war of nerves between Von Haag and Sims.
J.P. Kennedy
as Adm. William Sowden Sims
Roy Travers
as Capt. von Hagg
Douglas Herald
as Capt.-Lt. Stockmar - U-Boat 24
Jack McEwan
as Ober-Lt. Schwartz - U-Boat 24
