Note dell'editore
In the book, Poirot is a passenger on board a flight from Paris to Croydon. Some time before landing, one of the passengers, Madame Giselle - a wealthy French moneylender -- is found dead. Initially, a reaction to a wasp sting is postulated, but Poirot spies the true cause of death: a poison-tipped dart, apparently fired from a blowgun. It becomes apparent that the victim has been murdered.