A mysterious serial killer is shocking the underworld. Scotland Yard is investigating the case. Clues lead the detectives to Blackwhite Castle.

In 1944, a group of high command officers plot an attempt against Hitler, and one of the leaders of the conspiracy, Stauffenberg, goes to a meeting with the Fuhrer in charge of exploding the place. However, Hitler survives and the officers are executed. This unsuccessful operation was called "Valkyrie Operation", and this realistic movie discloses this true event.