“Leave this affair alone, Martinson—Jean Hallison is dead!”

and the mysterious caller rang off, leaving Inspector Jim Martinson with a headful of worries. Had Jean been savagely murdered, or was it a bluff to put him off the scent? But it was no bluff, and mystery piled on mystery. Where did the suave, grinning Montoni fit in?

Accused of assaulting two women—yet at the time of the alleged attack, Jim himself had been watching him elsewhere.

Could a man be in two places at once? And the playing cards with green dragons emblazoned on their backs—how did they link up the chain of evidence that Jim slowly tightened to finally rope in the sinister gang that terrorised Framcastle?