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Captain Hugh "Bulldog" Drummond is about to marry his fiancée Phyllisd Clavering, and has sequestered himself in his house with his faithful servant Tenny, cutting the cord to the telephone, so that nothing will interfere with his wedding plans. Colonel Nielson of Scotland Yard, meanwhile, comes home to find Richard Lane, a former nemesis, waiting for him. Lane demands to know about the Radio Signal Disintegrator, a new British spy device, but Nielson refuses to divulge information, so Lane holds him at gunpoint. Later, Phyllis arrives to pick up Colonel Nielson. After Lane tells her he is the new tenant of Greystone Manor, Phyllis pretends to leave, then hides and watches as Lane kidnaps the colonel. Phyllis picks up Hugh and Tenny, and Hugh's friend, Algy Longworth, follows them to Greystone Manor, where they learn from the reviving butler that the colonel has been taken to Morocco. Even though Scotland Yard tries to prevent their interference, Hugh and his friends take Hugh's private plane to Arbi, Morocco, where they are greeted by British consul Major Gray and his assistant, Deane Fordine. At the consulate, Hugh recognizes Lane, but Lane is using the pseudonym of Charles Mega. Hugh and his friends are ordered to fly back to England, but Hugh turns back and heads for Lane's estate in the jungle, landing just one minute before the bomb planted on their plane is scheduled to explode. Hugh and Algy infiltrate Lane's estate, just in time to rescue the colonel, who has been tied to a tree in front of a ravenous lion. There is a shoot-out, and during a struggle, Hugh pushes Lane off a balcony. Lane falls and is mauled by his own lion. Hugh, his friends and the colonel then fly safely back to England.