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This routine wartime drama is set at sea and involves a British convoy trying to elude a group of German U-Boats. After one of the U-Boats is singled out and captured, the British admiral in charge of the current operation hits upon an ingenious but almost suicidal way of defeating the Nazi boats. He orders Lt. Commander Tarlton (Edward Judd) and a group of men to get in the captured U-Boat and then join the other U-Boats as though they had simply wandered off course for awhile. If done quickly and efficiently, Tarlton should be able to radio back the position of the enemy for a fast British offensive. Not an easy task in itself, and made much worse considering that the RAF and other British ships are going to consider the decoy U-Boat to be the enemy.