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At the Rome airport two men are taken into custody. Inspector Scott Luce thinks their two suit-cases are full of drugs, but the suit-cases contains only white powder. Afterwards the corpse of Susan Palmer is found. She was a drug runner for the Cosa Nostra boss Frankie Agostino. Susan's friend, Jenny Ryan, meets a mysterious man from America, Arthur Ardigan, supposedly her cousin. In the meantime Inspector Luce is investigating.