The Alden children draw upon their resourcefulness to save the neighborhood firehouse from being torn down, while they also face a series of mysterious incidents connected with it.

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 investigate when a new store called the Game Spot opens in town and the neighboring shops are robbed.

"What will the Aldens discover on a vacation to a deserted island? Adapted from Gertrude Chandler Warner's story of the same name, this early reader allows children to start reading with a Boxcar Children classic"--Publisher's description.

While visiting an old mansion, the Aldens investigate the possibility that it may be haunted. Includes games and activities after text.

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

The Aldens try to solve a series of mysteries which took place in a old hotel in Kansas which they visit.

While vacationing at a friend's country home, the four Alden siblings try to find a long-missing, priceless brooch and investigate the existence of a ghostly stream.