Shortly after Hogan helps a journalist escape to freedom, the Germans are amazed to read an American newspaper story about a sabotage-and-subterfuge unit hard at work right under their noses at one of their POW camps.
It appears Sergeant Schultz will be shipped off to the Russian front after he accidentally interrupts a black market meeting. If he goes, Colonel Hogan will lose his courier of secret messages between Stalag 13 and a female spy.