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Readers generally praise this book as an entertaining and suspenseful mystery, often described as "twisty and turny," characteristic of the author's style. Many reviewers appreciate the intriguing setup, which starts with seemingly minor incidents at a student boarding house before evolving into a more serious investigation. The opportunity to see Hercule Poirot's secretary, Miss Lemon, and her sister, Mrs. Hubbard, take on more prominent roles is a highlight for some fans. The setting of the student hostel is frequently noted as unique and well-described, providing a fresh backdrop for the unfolding events and an eclectic mix of characters.

However, many reviewers consider this to be one of the weaker or "middle of the pack" entries in the Hercule Poirot series. A recurring criticism is Poirot's diminished role, with some noting his relative absence for significant portions of the story and that much of the investigative work is handled by other characters. The plot is occasionally described as less developed or even implausible in parts, with some finding the narrative monotonous after the initial incidents. A notable concern for contemporary readers is the outdated and at times stereotypical portrayal of diverse characters, reflecting the book's period of writing and leading to some "cringe" moments. Furthermore, a number of reviewers felt there were too many characters, making it difficult to connect with them or keep them distinct, which could detract from the overall impact.

Ultimately, the book offers an entertaining light mystery, though it may not be considered one of the author's most memorable or finest works. It is recommended for dedicated fans of Agatha Christie and Hercule Poirot, especially those who appreciate her later period writing and are accustomed to the conventions and occasional outdated elements of older novels. Readers who enjoy a solid, twisty mystery with a unique setting, even if Poirot is less prominent, are likely to find it a worthwhile read. While it may not provide the full measure of Poirot's typical characterizations or investigative style, it still delivers a classic whodunit experience.