Hercule Poirot is on a plane from Paris to London when one of the other passengers, Madame Giselle, is murdered. The murder weapon appears to be poison, delivered from a dart fired from a South American blowpipe. On board was Lady Horbury who owed the murdered woman a great deal of money - she is the prime suspect. Soon after Madame Giselle's death is announced, her daughter appears in Paris to claim her inheritance, but then soon disappears. A cross-channel investigation into Madame Giselle's murder, involving Chief Inspector Japp, the French police and Poirot, commences.
—grantss