The sudden, violent death of the wealthy and disagreeable Lord Wutherwood during a family gathering places the eccentric, impoverished Lamprey clan under immediate suspicion. Inspector Roderick Alleyn is tasked with navigating the complex social dynamics of the aristocratic household to determine if the family's desperate financial situation provided the motive for murder. The narrative follows Alleyn's methodical investigation as he peels back layers of charm and wit to reveal the underlying tensions within the family. The story is presented through a third-person perspective that emphasizes the contrast between the Lampreys' flamboyant personalities and the clinical precision of the police inquiry.

This work is widely regarded as a quintessential example of the Golden Age detective style, celebrated for its blend of humor and traditional mystery mechanics. Readers often highlight the Lamprey family as one of Marsh's most memorable and colorful creations, noting how their charm complicates the detective's task. The narrative is frequently praised for its balance of social satire and the rigorous logic expected of Inspector Alleyn's investigations. The book remains a staple for those who appreciate the intersection of character-driven comedy and classic whodunit plotting.