Paul Sherman of Interpol's Narcotics Bureau lands at Schiphol Airport. As far as he is aware no one but Jimmy Duclos knows of his arrival in Amsterdam. Duclos is there to meet him-and four men are there to meet Duclos. Sherman has to recognize that the gang of heroin smugglers he was out to smash know his movements as well as he does. Backed by Amsterdam's police, Sherman tries to outwit the ge...