The Germans capture Saunders (Vic Morrow) and place him in a makeshift prison compound along with three other newly acquired American prisoners: Sgt. Mike Martin (Claude Akins) and privates Coker (Ed Peck) and Murray (Carl Reindel). What Saunders doesn't know is that one of his three fellow POWs is a Nazi spy posing as an American. It is the spy's assignment to befriend his fellow prisoners and worm vital information out of them. Though Saunders knows enough not to reveal any secrets in front of anyone no matter what the circumstances, at least one of his "comrades" isn't quite so careful. ~ Hal Erickson, All Movie Guide