The Invisible Detective

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The Invisible Detective is a series of juvenile adventure novels, written by Justin Richards. Originally published in the United Kingdom between 2003 and 2005, the series has also been released in the United States.

The books are detective fiction with science fictional and/or fantastic elements (depending on the book). Set in London in the 1930s, the series recounts the adventures of four children, Art, Jonny, Meg, and Flinch, who act as "Baker Street Irregulars" to the detective Brandon Lake, who is known as "the Invisible Detective" as no one has seen more than his silhouetted figure in 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.