"Gun Cotton takes a brief holiday in one of the quietest and most secluded spots on the Sussex coast, where he comes in contact with the successors of the old smugglers who plied their trade along those shores, but now the contraband being run is human contraband. A clever plot to infest England with a most virulent and dangerous political disease - a kindly old Professor blackmailed into becoming an enemy to his beloved country - a beautiful girl ruthlessly murdered in a lonely cottage, and bullets flying in the night..."