Reinhard Heydrich helped draft the machinery of the Holocaust and ran occupied Czechoslovakia with such ferocity that Czechs called him the Hangman. This film reconstructs the London-planned operation to kill him, five months of preparation by exiled Czech agents trained by British intelligence, ending in a roadside ambush on a Prague street in December 1941. Heydrich survived the initial attack but died of his wounds eight days later, and the film follows the manhunt and reprisals that followed, including the destruction of Lidice and the deaths of hundreds of Czechs at German hands. Archival photographs, wartime footage, and expert interviews trace the assassins' escape, their eventual siege inside a Prague church, and the debate historians still have over whether the operation's cost in civilian lives was worth removing one of the Reich's most efficient killers. The film keeps its focus on the operational details, the planning, the ambush itself, and the brutal Nazi response, rather than on broader Holocaust history.