An action-packed instalment from the hugely popular series of thrillers based on author H.C. "Sapper" McNeile’s novels about ex-military man and soldier of fortune: Captain Hugh "Bulldog" Drummond (John Lodge). The plot centres on a group of nefarious armaments smugglers disguised as a pacifist organisation and headed by Ivan Kalinsky (Hugh Millner). They plan to steal the blueprints to Britain’s new remote-controlled warplane. When their plans are rumbled by Scotland Yard they kidnap the inventor: but not before he manages to put out a desperate signal for help, picked up later by Bulldog. Fending off the suspicious attentions of femme fatale Doris (Dorothy Mackaill), Bulldog and trusty sidekick Algy (Claud Allister) set about a rescue. Directed by Norman Lee and widely regarded as the closest of the film series to author Sapper’s original concept.