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

Frank, Joe, Callie, and Iola travel to the Middle East to recover a stolen art treasure and free their friend Chet Morton, who has been accused of the theft.

Frank, Joe, Callie, and Iola investigate a group of sky divers who may be diamond smugglers and a young woman who appears to be the victim of identity theft.

When priceless antiques begin to disappear from Squire Grizzly's mansion, the ghost of his ancestor Bad Bart is suspected.

Meg witnesses a theft during a trip to an authentic medieval castle with her class and must piece together the clues offered in the text and illustrations to solve the case.

Thirteen-year-old Jas tries to prove that the owner of the farm where she works has killed her favorite horse, Whirlwind.

The Aldens investigate when the arrival of several suspicious characters in Greenfield coincides with a mystery involving a popular boy actor.

While on field trips the kids of Franklin Middle School solve various crimes, including such mysteries as a museum painting that is really a copy, missing ticket money for a frontier town, recycling machines being shut down, and missing endangered foxes.

When the sheep on Nicky's family's ranch start losing their wool, the Thea Sisters head to Australia to investigate.

Orphans Amy and Dan Cahill, continuing their worldwide quest to track down the thirty-nine clues that will reveal the secret of the Cahill family's power, follow a link to one of the planet's strongest fighters, and have a run-in with the unreliable Alistair.