The solutions to ten mysteries solved by Leroy "Encyclopedia" Brown are given in a separate section challenging the reader to match wits with the ten-year-old mastermind of Idaville's war on crime.

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.

Encyclopedia solves mysteries for the neighborhood kids through his detective agency. But his dad is also the chief of police, and every night, Encyclopedia helps him solve his most baffling crimes. Join Encyclopedia Brown on fifteen of his toughest, most exciting cases ever, including a case of stolen diamonds, a skunk ape, a hit-run car, an Arctic explorer, and more. And with the clues given in each case, you can solve these mysteries, too!