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The crime novels of Edgar Wallace have enjoyed enormous popularity in Germany, and this movie thriller marks approximately the 30th time his novels have had a German screen adaptation. Sir John (Siegfried Schuerenberg) and Inspector Craig (Hansjoerg Felmy) of Scotland Yard travel all over the city of London in their attempt to unravel the evidence needed to put a big drug-smuggling organization out of business. There are certainly enough corpses to provide clues, as the gang they are pursuing is unusually desperate and ruthless.