Death in the Clouds by Agatha Christie

On a flight from Paris to London, a woman is found dead in her seat—apparently killed by a poisoned dart mid-air. Among the passengers is none other than Hercule Poirot, who finds himself both a suspect and the investigator. As he interviews fellow travelers and reconstructs the in-flight events, he uncovers hidden relationships and a daring plan executed in plain sight. The mystery hinges on misdirection, timing, and the confined setting. It’s a classic Poirot puzzle with a deadly twist at 10,000 feet.