The Invisible Detective

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. 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 Invisible Detective

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. 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.