Ten brief cases allow the reader to match wits with ten-year-old crime-buster, Encyclopedia Brown, as he investigates such cases as whether a diary of George Washington's mother is authentic, or if a UFO picture supposedly taken by the army is real.

Dunkum follows a trail of secret coded messages to find his missing autographed basketball.

A college fraternity treasure hunt is marred by accidents and dirty tricks - Nancy must find the culprit before the whole event is shut down.

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.

Fifth-grade sleuth Cam Jansen uses her photographic memory to catch a thief during a department store sale.

The Hardy brothers' search for the missing son of a wealthy industrialist leads them to Brazil and great danger.

Valuable antique weathervanes are being stolen in the Pennsylvania Dutch country. A Navy employee removes a top secret document from the Pentagon. The Hardy brothers try to solve these two seemingly unrelated mysteries.

When someone attempts to frame his best friend for murder at St. Benedict's boarding school, junior Luke Chase starts investigating on his own and discovers multiple suspects with darks secrets in their past.

Seventeen-year-old Emma Paxton steps into the life of her long-lost twin Sutton to solve her murder, while Sutton looks on from her afterlife.