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The Aldens, while testing the latest version of their favorite computer game, are surprised to find messages directed specifically at them.

The Aldens help out at a medieval fair and try to find a valuable sword which has been stolen from the fair.

The Alden children hunt for their late grandmother's necklace that has been missing for years.

The Aldens investigate when exotic and endangered animals begin to disappear from the zoo where their new friend Lindsey works.

In this very special mini-series, 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 arrive in Egypt but the agent they’re supposed to meet has gone missing! With the help of a puzzle in a papyrus scroll, they figure out their next mission—to deliver a tiny ancient pharaoh statue to an archaeologist at the Pyramids! Along the way they outwit a...

"Hace muchos anos 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!"-

When the Alden children climb to the top of Old Flat Top Mountain, they encounter a mysterious mountain cave, a perilous rockslide, and a secret treasure.

The Alden children save an old woman's house, land, and all the animals in her animal shelter from greedy contractors.

The Alden children suspect someone of trying to sabotage the local dog show.

The Alden children investigate various mix-ups at a zoo run by their grandfather's friend in an effort to save it not only from pranksters but also from the town council.