January 1944. British pilots Brian and James jump out by parachute from a damaged plane over Germany. While fleeing the chase, they manage to get into a hospital train carrying wounded people from the Eastern Front.
After taking the personal documents of German officers, resourceful Britons simulate insanity and end up in a hospital located in the mountains of the Black Forest. But soon it becomes clear that in the ward with the strange name “Alphabet House” there are other simulators—four SS men who drove a wagon of stolen valuables into Germany and want to wait out the war in a quiet place…
The situation of the newcomers becomes threatening. What fate awaits Brian and James if they’re discovered? How to escape this terrible trap?