Relates the exploits of the four Alden children as they locate a missing man.

Grandpa Alden and the Alden children encounter danger, excitement, adventure, and mystery in a quiet island fishing village.

"Henry, Jessie, Violet, and Benny are spending the summer on a houseboat! Throughout the journey, the children have the feeling they're being watched-- and they are. Someone wants something on their boat, and he'll stop at nothing to get it. Can the Boxcar Children figure it out what it is before it's too late?"--Page 4 of cover.

Six children help solve the mystery of a missing spyglass that has kept two brothers feuding for years.

A friendly writer with a metal detector, the mysterious inhabitants of a tower house, and the discovery of a locket in the sand are ingredients for the Aldens' latest mystery.

The Alden children, isolated in a storm at a small bus station, are led into a mystery centering on a polluted river.

"Siblings Henry, Jessie, Violet, and Benny used to live in a boxcar. Now they have adventures everywhere they go. What secrets will the children find on their very own island?"--

The Boxcar Children's friend Mike is wrongly accused of starting a fire. Can they discover who is really behind Mike's mystery?

The Alden children start out on a one-day mountain climbing excursion that becomes very exciting. They unearth some mysteries and some treasure and have a good time in the process.

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