Idaville's secret weapon against lawbreakers, ten-year-old Leroy "Encyclopedia" Brown, helps the police force solve ten new cases, the solutions to which are found in the back of the book.

The case of the hollow tree -- The case of the headless ghost -- The case of the stolen moonstone -- The case of the disappearing hundreds -- The case of the patriotic volunteer -- The case of the stolen watch -- The case of the gym bag -- The case of the supercomputer brain -- The case of the giggling Goldilocks -- The case of Shoeless Sam -- Solutions.