Death on the Nile by Agatha Christie

"Death on the Nile" by Agatha Christie is not part of a series but features her famous detective, Hercule Poirot. The story is set aboard a luxurious riverboat cruising on the Nile River in Egypt. When a murder occurs during the voyage, Poirot is called upon to solve the case. As he investigates, he discovers a web of secrets, motives, and potential suspects among the passengers, leading to a complex and suspenseful mystery. The novel is a classic example of Agatha Christie's mastery of the murder mystery genre.