Charles Tang

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.

Someone is trying to put Aunt Jane's motel out of business, but the Alden children aren't going to let that happen.

While on a camping trip with their grandfather, the Alden children try to find out about the loud music and missing food that threatens to scare away other campers.

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.

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

The Aldens search for carousel horses that have disappeared from an amusement park.

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

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

The Aldens become involved in a community theater production of "The Wizard of Oz," which is systematically and mysteriously being sabotaged.

The Alden children have another mystery to solve when they visit a castle and must figure out which of the guests has stolen the Stradivarius violin.