Having just survived the horrors of the First World War, Great Britain faces a new, more insidious threat: all across the country, clandestine groups of radicals are committing acts of sabotage and terror, with the ultimate goal of bringing about a Communist revolution in Britain. But these terrorists face a new terror of their own as their plans are foiled, their meetings raided, and their members kidnapped—all by a mysterious band of men dressed in black. Who’s behind the so-called “Black Gang”? The terrorists have no idea, and neither do Scotland Yard nor the media. Could the leader possibly be war hero-turned-gentleman sleuth Hugh “Bulldog” Drummond , continuing his struggle against his archenemy, Carl Peterson?