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 Friendly Watch Dog -- The Case of the Red Roses -- The Case of the Jelly Bean Holdup -- The Case of the Soccer Scheme -- The Case of the Hole in the Book -- The Case of the April Fool's Plot -- The Case of Wilford's Big Deal -- The Case of the Ten-Dollar Bike -- The Case of the Hidden Money -- The Case of Lovely Lana.