On board the Paris-Croydon flight, the famous detective Hercule Poirot sleeps peacefully, not even knowing what is happening literally next to him. When he wakes up, he learns that his neighbor on the plane, an elderly Frenchwoman Madame Giselle, has been found dead. At first, her death is attributed to a wasp bite, but Poirot finds out that the woman died from an injection with a poisoned dart. According to the conclusion of the doctor, the death occurred as a result of poisoning with the rarest poison .. There are only ten passengers and two stewards on board the plane - and one of them is a killer. Poirot himself is also under suspicion - an extremely unusual role for a well-known detective...