"Whose Body" is something of an apprentice work. Lord Peter is here more a bundle of characteristics than a character: a collector of rare books and incunabula, facile with quotations, fluent in French and probably in Latin, a skillful and sensitive pianist who never needs to practise, slightly built but possessed of "curious" strength and speed which he maintains without exercise. Over subsequent books, this caricature smooths and deepens into one of the most interesting and attractive detectives in fiction.
In spite of its awkwardness, Whose Body is worth reading. The plot is clever, the villain is believable and sadistic, and most of the supporting characters are a delight. Some of these characters are further developed in later novels: Bunter, Parker, the Dowager Duchess, Freddy Arbuthnot. Others fortunately are not. Sayers is much better with people she might recognise as "like us" then with people from other social groups.