Tidal Basin was the toughest, poorest, lowest section of London, and somewhere in it's dark alleys lurked the Devil of Tidal Basin, terrifying the inhabitants , puzzling the police. What connection had the Devil with White Face, the lone bandit who roamed London unmolested? Superintendent Mason, one of the Yard's Big Five wanted to know, and what Superintendent Mason wanted to know he generally found out. Criminals knew him as "Sympathetic" Mason, because of his curious methods of cross-examination. But not until Janice Harmon fell in love with a man who had written her from South Africa did the tangled skeins of international crime, murder and mystery begin to sort themselves out - and the strange story of a cold blooded killer come out into the light at last. This is Edgar Wallace at his best - and Edgar Wallace is known the world over as "the KING of mystery writers.