During World War II, American soldier harry Cook (Doug McClure) and his team are sent to Norway to aid in the defection of Halden Brevik (René Auberjonois), a scientist working on the atomic bomb for the Germans. Captured by the Germans and sent to the Colditz POW prison camp in an alpine castle on the German-Swiss border, Cook must find a way to escape with the scientist before the Gestapo discovers the Norwegian's true identity. The prisoners pin their hopes for freedom on a homemade glider, ingeniously designed and built by the prisoners inside the walls of the fortress!

Based on a true World War Two story, this made-for-television thriller also stars Richard Basehart (Voyage to the Bottom of the Sea), Chuck Connors (The Rifleman), Max Baer, Jr. (The Beverly Hillbillies), and Tom Skerritt (Picket Fences).