Jeff Clayton, who has already won $5,000 at poker when the game’s big loser returns, asking for one last hand. This time, the stranger will wager his portion of a ranch. He loses, tries to gun down Clayton in despair, and loses again, winding up dead on the floor of the saloon.

Shortly after his return from India, a special agent of the British secret service falls victim to an insidious poisoning in London. Scotland Yard gets involved. But too late: valuable information has fallen into the hands of an international criminal gang...