'Demobilised officer, finding peace incredibly tedious, would welcome diversion. Legitimate, if possible; but crime, if of a comparatively humorous description, no objection. Excitement essential... Reply at once Box X10.' Hungry for adventure following the First World War, Captain Hugh 'Bulldog' Drummond begins a career as the invincible protectorate of his country. His first reply comes from a beautiful young woman, who sends him racing off to investigate what at first looks like blackmail but turns out to be far more complicated and dangerous. The rescue of a kidnapped millionaire, found with his thumbs horribly mangled, leads Drummond to the discovery of a political conspiracy of awesome scope and villainy, masterminded by the ruthless Carl Peterson.