Chesterton may be held to have invented a new species of detective story--the sort that has no crime, no criminal, and a detective whose processes are transcendental. _The Club of Queer Trades_ is the first batch of such stories. _The Man who was Thursday_ is another specimen of some length. More recently, Chesterton has repeated the type in some of the _Father Brown_ stories. In _The Club of Queer Trades_, the transcendental detective is Basil Grant, to describe whom with accuracy is difficult, because of his author's inconsistencies. Basil Grant, for instance, is "a man who scarcely stirred out of his attic," yet it would appear elsewhere that he walked abroad often enough. The essentials of this unprecedented detective are, however, sufficiently tangible. He had been a K.C. and a judge. He had left the Bench because it annoyed him, and because he held the very human but not legitimate belief that some criminals would be better off with a trip to the seaside than with a sentence of imprisonment. After his retirement from public life he stuck to his old trade as the judge of a Voluntary Criminal Court. "My criminals were tried for the faults which really make social life impossible. They were tried before me for selfishness, or for an impossible vanity, or for scandal-mongering, or for stinginess to guests or dependents." It is regrettable that Chesterton does not grant us a glimpse of this fascinating tribunal at work. However, it is Grant's job, on the strength of which he becomes the president and founder of the C.Q.T.--Club of Queer Trades. Among the members of this Club are a gentleman who runs an Adventure and Romance Agency for supplying thrills to the bourgeois, two Professional Detainers, and an Agent for Arboreal Villas, who lets off a variety of birds' nest. The way in which these people go about their curious tasks invariably suggests a crime to Rupert Grant, Basil's amateur detective brother, whereupon Basil has to intervene to put matters right. The author does not appear to have been struck by the inconsistency of setting Basil to work to ferret out the doings of his fellow club-members. The book is, in fact, full of joyous inconsistencies. The Agent for Arboreal Villas is clearly unqualified for the membership of the Club. Professor Chadd has no business there either. He is elected on the strength of having invented a language expressed by dancing, but it appears that he is really an employee in the Asiatic MSS. Department of the British Museum. Things are extremely absurd in _The Eccentric Seclusion of the Old Lady_. At the instigation of Rupert, who has heard sighs of pain coming out of a South Kensington basement, Basil, Rupert, and the man who tells the story, break into the house and violently assault those whom they meet.