Blackmailer and moneylender ugly old Parisian Mme Giselle dies instantly from a prick in the neck by rare South American boomslang snake venom, while Belgian detective Hercule Poirot rests his eyes, and someone hides the blowgun beneath his aeroplane seat. One clue lies in the contents of ten passenger pockets and bags, but the faithful maid has burned client records. Death in the Air - U.S. publishers changed titles until fan letters flooded author.