A quiet September afternoon in Brecon, Wales and a Nazi SS officer mysteriously appears on the street. Entering a police station he shoots two police officers but later commits suicide. University lecturer Polly Probert picks blackberries along a disused Welsh railway track when a train passes and disappears. A lunch box thrown out bears a Reichbahn logo and a price in marks. When she and her colleague and lover Harry Long are working in a remote mountain valley they see a concentration camp and nuclear reactor. A Nazi officer arrives at what he expects to be a Waffen SS base but finds...