A cryptic crossword puzzle serves as the catalyst for Chief Superintendent Henry Tibbett to uncover a lethal secret buried for two decades. Henry Tibbett and his wife, Emmy, find themselves entangled in a complex investigation after a group of mystery writers creates a puzzle that points toward a real-world crime. As they navigate the social circles of the suspects, the Tibbetts must decipher clues hidden within the wordplay to identify a killer. The narrative follows a traditional procedural framework, emphasizing logical deduction and the careful observation of human behavior. The investigation is constrained by the passage of time, as the primary events trace back to a cold case that continues to exert influence over the present.

Readers frequently highlight the clever integration of the crossword puzzle theme into the central mystery. Discussion often centers on the dynamic between Henry and Emmy Tibbett, noting their grounded approach to investigation compared to more flamboyant fictional detectives. Critics often praise the author for maintaining a steady pace that rewards attentive readers who enjoy piecing together clues alongside the protagonist. The atmosphere is consistently described as classic and refined, appealing to those who prefer character-focused puzzles over high-octane action sequences. Many readers appreciate how the narrative balances the lighthearted nature of the puzzle premise with the gravity of the underlying crime.