When a woman is found dead on a crowded flight from Paris to London, Hercule Poirot must identify the killer among a small group of passengers who all had the opportunity to commit the crime. Poirot faces the challenge of a confined setting where the murder weapon, a poisoned dart, could have been deployed by any of the suspects seated nearby. He must navigate the complex social dynamics and hidden motives of the passengers while contending with the physical constraints of the aircraft. The narrative follows a classic third-person perspective, focusing on the meticulous observation and logical deduction required to solve a seemingly impossible murder.

This novel is widely regarded as a quintessential example of the classic whodunit, showcasing the author's ability to construct intricate puzzles within restricted environments. Readers often highlight the clever use of the airplane setting, which forces a diverse group of characters into a high-stakes confrontation. The pacing is noted for its steady, logical progression, keeping the focus squarely on the detective's analytical process. It remains a staple of the genre, frequently cited for its tight plotting and the effective deployment of a singular, ingenious murder method.