“Let me have a man for one night, and I’ll have him confessing he’s the king of England,” Lavrentiy Beria bragged to his colleague, Nikita Khrushchev. He was intelligent and intriguing and cynical. He was also violent, unethical, and prone to using ruthless measures, including kidnapping, torture, rape, and murder. And he was almost the ruler of the Soviet Union after the Second World War – until his former colleagues executed him for treason.