The French underground is in desperate need of valuable radios, so Hogan decides to utilize Colonel Klink's former girlfriend to ensure the delivery of the equipment.

Colonel Klink is set up for execution after the gestapo finds him with underground information --- planted on him by Hogan.

Hogan plots to keep a secret device, hidden on board a downed plane, from the Germans.

When three Gestapo officers detain Hogan and Carter, the two frantically plan their escape --- until they learn the officers want to defect.