For the first time, Scotland Yard opens its secret files to bring us the authentic true stories of some of its most famous cases. The title comes from the emergency telephone number in use at the time, and the series was introduced by Chief Superintendent Davidson, curator of the Crime Museum – more commonly known as the Black Museum - at Scotland Yard, London, England.

In 1945 Scotland Yard’s Special Branch are consulted when a Russian defects to the Royal Canadian Mounted Police in Ottawa, Canada…