The Boxcar Children are on a trip with Grandfather to a beautiful island in the South Seas! The island is supposed to be deserted, but as the Aldens explore, they start to find signs that suggest they are not alone. Is there a castaway living somewhere on the island?

The Aldens begin their adventure by making a home in a boxcar. Their goal is to stay together, and in the process they find a grandfather.

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

Two brothers take summer jobs at a department store where a series of peculiar events brings them under suspicion.

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

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.

When the Alden children accompany their grandfather to the Snow Haven Lodge, a series of odd occurrences threaten to disrupt the annual winter games.

Grandpa Alden and the Alden children find excitement and adventure in a quiet island fishing village.

The Boxcar Children are excited to attend a young astronomers' convention! But when a student goes missing, will the children be able to help?

When the Aldens go to dinner at a local Chinese restaurant, Benny can't wait for his favorite part of the meal, dessert. But, when Benny opens his cookie, instead of a fortune, he finds a handwritten riddle!