The Aldens investigate the rumors of ghosts, disappearing props and a haunted seat in the Trap-Door Theater.

While visiting Lake Lucille in the Adirondack Mountains, the Aldens hear stories about a monster in the lake and then encounter evidence that it may be real.

While staying at a hotel in New York City, the Aldens investigate a series of annoying pranks plaguing the management and guests.

The Aldens are helping out at a rescue ranch for horses. Jessie's favorite is a beautiful horse named Dragon. When Dragon and other horses disappear from the pasture, the Boxcar children must saddle up for a mystery. What's happening to the horses at the Dare To Dream Ranch?

While on a cruise with their grandfather, the Alden children help discover who is behind the mysterious troubles of the ship--disconnected phone lines, engine trouble, a man overboard--and still have fun sightseeing, eating, and swimming.

"Hace muchos años un hombre desaparecio de la casa amarilla de la isla de las sorpresas. ¡Los hermanos Alden han encontrado una pista para resolver este intrigante misterio!"--

In this all-new very special miniseries, the Aldens have been recruited by a secret society to return lost artifacts and treasures to their rightful locations—all around the world! The Aldens follow a clue to Beijing, China, where they uncover their next mission—to return a mysterious clay artifact to its rightful owner. Their journey leads them to a scenic section of the Great Wall, but a thief threatens to ruin their trip and endanger their...

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

"The Aldens try out a Halloween escape room. The puzzle are fun to solve. But when eerie events start scaring people away, the children find a much bigger case to crack." --

Jessie wants her science fair project to make a difference. So when she gets the chance to test a local creek for pollution, she can't wait to get started. But when things start going wrong with her experiment, Jessie and her siblings don't just have an experiment to investigate, they have a mystery to solve!