"October 1941." A ferocious battle on the North Atlantic of World War II is not going well for the Allies. Canadian Convoy SC42 is battling high winds, stormy seas, and German U-boats. Ships, men, and cargo are being lost at an alarming rate. "HMCS Blackfoot," Canada's first Tribal Class Destroyer, answers the convoy's desperate call for help.

For "Blackfoot's" Yeoman of Signals Matthew Brock, it is his first encounter with the U-boat and its ambitious commander, Lieutenant Klaus Hartenstien. While attacking the U-boat, Matthew is engulfed in a strange, blue light-"Blackfoot" is embraced...