Death on the Nile (S09E03)

Set on board a Nile cruise where, against Poirot's advice, a heartbroken Jacqueline De Bellefort has joined the trip to stalk her former fiance and his new heiress wife. When the unfortunate heiress is found shot in the head, Jackie has the perfect alibi. She was locked in her cabin for attacking her ex-love. Poirot suspects one of the other passengers may have had a grudge against the victim. The tension rises as more bodies are found. (iTunes)