A cryptic request for a portrait leads Sir John Appleby into a web of deception and hidden motives. Sir John Appleby, the astute investigator, finds himself entangled in a complex scenario involving an unusual commission that masks deeper, more sinister intentions. He must navigate the social intricacies of the British upper class while deciphering the logical inconsistencies presented by the suspects. The narrative follows a traditional investigative framework, emphasizing the intellectual challenge of uncovering the truth behind a facade of propriety.

Readers frequently highlight the wit and erudition present in the writing style of Michael Innes. Discussion often centers on the intricate plotting and the cerebral nature of the mystery, which prioritizes intellectual engagement over visceral action. Critics note that the atmosphere is carefully constructed to reflect the social mores of the era. Many enthusiasts of classic detective fiction appreciate the balance between character observation and the mechanical requirements of the whodunit format.