In August 1940, a man walked into Leon Trotsky’s study in Mexico City and drove an ice pick into his skull. The killer? Ramon Mercader – an aristocratic Spaniard turned Soviet assassin. The mastermind? Joseph Stalin. But this was no simple hit. It was the climax of a decade-long global hunt: a story of seduction and betrayal, of fake identities and secret loyalties, of idealists and fanatics, lovers and spies. While Trotsky raged in exile – still clinging to his revolutionary dream – Stalin’s agents closed in. And at the heart of it all was Mercader: a man trained to lie, charm and ultimately to kill.