The documentary detective series delves into the lives of criminal underworld figures, high-profile criminal cases of the 1940s-1950s, and the legendary bandits and investigators of that era. The series unveils little-known facts about the activities of infamous figures such as Batka Angel, the raider Serge Astrakhansky, and the safecracker nicknamed "Sledgehammer." The episodes provide a detailed look at the covert operations of secret intelligence agencies, previously classified historical events, and exclusive archival footage that had been kept from the public eye. Each installment explores topics such as saboteurs, the fight against fascists, the clash between SMERSH and the Abwehr, espionage, post-war famine, and the rampant rise of banditry.