Gentleman detective shares some features with the later gentleman detective. He was "…the first fictional detective of importance and the model for virtually every cerebral crime solver who followed." More specifically, Dorothy L. Sayers noted that "Sherlock Holmes modelled himself to a large extent upon (Poe's) Dupin, substituting cocaine for candlelight, with accompaniments of shag and fiddle-playing." Dupin is French, not English, but is probably a "gentleman". He comes from a once wealthy family but has been reduced "by a variety of untoward events" to more humble circumstances. He is entirely amateur and contents himself only with the basic necessities of life.
The Invisible Detective a darkened room. In fact, Brandon Lake does not exist; he was invented by the four children, who investigate all his cases themselves. Art plays the Invisible Detective in weekly sessions held in a darkened room, during which the Detective addresses the concerns of local residents, in exchange for a small fee. Each book also has a parallel subplot set in the 2000s, where Art's grandson, also named Art, and his friend Sarah have related mysteries to solve. The titles in the series are: The series revolves around the cases of eponymous detective, Brandon Lake. The books' protagonists are the