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"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!"-

The children investigate an old house from which a man vanished years ago. They find a letter that may be a clue.

Mike Wood presents many strange happenings for the Alden children to solve when they spend the summer at Mystery Ranch. Mientras los ninos Alden visitan a la tia Jane, se incendia una casa vecina. Su amigo Mike es acusado de haber iniciado el fuego. Podran los Alden encontrar al verdadero criminal? --Page 4 of cover.

The Aldens are helping out at a doughnut shop, but when a rival store opens across town, strange events follow, and the children have a mouthwatering mystery to solve!

At the same time that the Alden children's efforts to raise money for a new hospital wing are being sabotaged by nasty tricks, they find their attempts to befriend the new girl Beth frustrated by her strange behavior.

The Aldens are visiting friends for a big Dia de los Muertos celebration. The kids love learning about the holiday and helping out - that is until mysterious events threaten to ruin everyone's preparations. Can the Aldens figure out what's going on and help their friends save the celebration?

When their grandfather arranges for them to spend two week at Sunny Oaks, the four Alden children enjoy settling into the routines of farm life but become suspicious about a mysterious horse locked in the stables.

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

On a camping trip to Arizona with their grandfather, the Alden children search for a lost gold mine.

When the Aldens visit a university campus, they must solve a mystery involving an old library whose stone gargoyles seem to move on their own.