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Readers largely praise this Hercule Poirot mystery as an engaging and enjoyable read, often citing it as a favorite among Christie's works. A standout element for many is the return of Captain Hastings as narrator, whose dynamic with Poirot and internal musings are consistently highlighted as a source of charm and humor. The inclusion of Bob the dog is universally adored, with reviewers finding his presence, "dog thoughts," and imagined monologues to be a delightful and unique aspect that adds a special touch to the story. The plot itself is described as captivating, featuring multiple twists and turns that keep readers guessing until the very end, showcasing Poirot's "little grey cells" in their meticulous pursuit of the truth, even when clues are scarce. The crisp narrative and steady pace contribute to an entertaining and addictive reading experience.

Despite its many strengths, some readers felt that the mystery was not among Christie's most brilliant, occasionally deeming it "unremarkable" or "underwhelming" when compared to her peak works. A few found the central premise, which relies on a character's delayed communication, to be somewhat contrived, and the motive behind the crime - financial gain - was seen by some as less original. While generally appreciated, the pacing was occasionally described as slow, and a few reviewers noted what they perceived as plot conveniences that aided Poirot's investigation. Additionally, some characters were considered less empathetic or developed than in other novels, with Poirot himself sometimes appearing less sharp or his disguises less convincing than usual.

Overall, this book offers a classic Agatha Christie mystery experience that, while perhaps not her most groundbreaking, remains highly entertaining. Its enduring appeal lies in the beloved partnership of Poirot and Hastings, combined with the memorable and endearing presence of Bob the dog. It is highly recommended for established fans of Hercule Poirot and Agatha Christie, especially those who appreciate her signature intricate plots and psychological insights. Readers looking for a cozy, character-driven mystery with a charming animal companion and the classic "little grey cells" at work will find much to enjoy in this engaging tale.