The sudden death of a quiet chemistry mistress, initially attributed to natural causes, triggers a complex investigation when an inexplicable fortune is discovered in her bank account. Inspector Sloan of the Berebury CID must navigate a web of greedy relatives and a mysterious beneficiary to uncover the truth behind the woman's demise. The narrative follows a traditional procedural structure, focusing on the methodical collection of clues and the interrogation of suspects. Sloan faces the challenge of deciphering a cunningly executed crime that leaves little physical evidence behind. The story maintains a logical, puzzle-oriented progression, emphasizing the interplay between motive and opportunity.

This work is characteristic of the traditional British mystery genre, prioritizing clever plotting and a methodical approach to crime-solving. The narrative relies on the interplay between the detective's analytical process and the social dynamics of the suspects involved. Readers often appreciate the author's ability to construct a neat, logical puzzle that challenges the audience to identify the culprit alongside the investigator. The tone remains consistent with the golden age style of detective fiction, focusing on the mechanics of the crime rather than visceral action. The book serves as a representative example of the Inspector Sloan series, showcasing the author's skill in crafting intricate, character-driven mysteries.