Challenges readers to solve ten mysteries using the same clues as the ten-year-old detective Encyclopedia Brown, with answers given in a separate section.

The solutions to 10 mysteries solved by Leroy "Encyclopedia" Brown are given in a separate section, challenging the reader to match wits with the 10-year-old mastermind of Idaville's war on crime.

The Hardy brothers interrupt their investigations of jewelry-store holdups to answer a plea from their cousin on a New Mexico cattle ranch.

Jim Qwilleran and his cats investigate a hotel bombing that killed a housekeeper and the disappearance of a mysterious woman after the blast.

After her vacation cottage is ransacked, Nancy discovers the popular tourist retreat she is staying at is a hotbed of deception and crime. Her investigation leads her to a labyrinth of caves where--according to rumor--a treasure of gold is hidden. But someone wants the truth behind the legend to stay buried forever, and the deeper Nancy digs, the more perilous her search becomes.

Nancy's vacation at a winter lodge is plunged into mystery when the lodge's tame pet wolf suddenly disappears.

Joe Talbot, Wishbone the dog, and David Barnes head to Lost Lake to search for a gold-and-diamond watch that Joe's father also searched for twenty-five years ago--but they wind up involved in a more serious--and dangerous--mystery.

While searching for the guard end of a broken saber that will solve one mystery, the Hardy brothers become involved with a gang of bank robbers.

Mandie and her friends have a new mystery to investigate when strange sounds come from a seemingly abandoned fishing boat.