 Lt. Hanley comes across three German soldiers in a deserted French town. Two are killed and he captures the third...a demolition expert. He tells Hanley that the entire town is mined and booby trapped to kill American soldiers. When Hanley finds out there is no way to prevent the returning French population from reentering the town he forces the German to disarm the mines and traps at gunpoint. Hanley must be on constant guard because the German is very clever and always thinking of escape.