Plot: Kaiser Wilhelm of Germany is seeking to embarrass the British Government by using Herr Von Heumann, one of his agents, to hand back a priceless black pearl, which had once been a gift from Queen Victoria to her daughter, to the tribal leader from whence it originally came in the South Pacific, an area dominated by the British. Raffles is naturally infuriated at the behaviour of the Kaiser, but he is also very interested in acquiring the pearl for his own use