The Alden children visit a family friend at his apple orchard which is rumored to be haunted, but instead of a ghost they find that some of the families' valuable antiques are being stolen.

"Five friends are ready for their school's Olympics field day. But not everyone wants to play fair someone is trying to ruin the events! Can the kids in the Most Valuable Player club solve the mystery, save the Olympics, and take home the gold? Includes sports facts"--

Fifth-grade sleuth Cam Jansen uses her photographic memory to solve a monkey-smuggling mystery at the city zoo.

The Aldens try to help a visiting Russian gymnast who is surrounded by mysterious people and events and who seems to have a secret.

"Everyone loves the new teacher, Mr. Merlin. Mr. Merlin used to be a spy, and he knows all about secret codes and the strange and gross ways the police solve mysteries..."

"With a knack for trivia, 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 as he solves ten confounding mysteries, including a case with mystifying cave drawings, a mysterious wanted man, and more. And with the clues given in each case, readers will have a chance to solve the...

When the Aldens visit Peggy and Doc Firmin's farm, they're in for a treat: a behind-the-scenes look at a real teddy bear workshop! But a very rare and valuable bear has disappeared from the toy hospital. Now it's up to the children to track down the teddy thief!

The Boxcar children uncover a mystery on a train trip from Boston to San Francisco.

When Poison Ivy tries to turn Gotham City into a jungle, Batman comes to the rescue.

After her troublemaking twin, Scarlet, vanishes from Rookwood Boarding School, shy Ivy tries to track her down, using pieces of Scarlet's journal carefully hidden all over the school for Ivy to find.