When the formidable Captain Hugh ‘Bulldog’ Drummond places this newspaper advert, hungry for adventure after the end of the First World War, he embarks on a career as the invincible guardian of his country. His first reply comes from a beautiful young woman, who sends him 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.