Summer vacation on an almost private island gives the Aldens a challenge. Henry, Jessie, Violet and Benny used to live alone in a boxcar. Now they have a home with their grandfather and are spending the summer on their own private island. There is a mysterious stranger on the island with a secret--but that's not the only surprise in store for the Boxcar Children.

The four Alden children have new neighbors and they're all building a tree house.

"When the Aldens visit their cousins, they're in for a surprise-- there's an amusement park nearby! It has everything they could ask for, with plenty of rides and games. But the children see strange lights coming from the closed park at night. And then a mysterious phone call warns them to stay away! Just what is going on at the amusement park?"--P. [4] of cover.

"Henry, Jessie, Violet, and Benny have a fun new job: fixing up an old castle! The spooky old place will be turned into a museum, but first the Aldens must figure out why so many odd things keep happening. Keys go missing, strange music comes from a deserted tower, and soon the Boxcar Children discover the castle has a amazing secret!" -- p.[4] of cover.

"Henry, Jessie, Violet, and Benny used to live in a boxcar. Now they have adventures everywhere they go. At a lighthouse, the children find a mystery in the night!"

"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?"--P. [4] of cover.

"The Aldens are spending sunny days at the shore and summer nights in a mobile home righ on the beach! One morning, Benny finds a gold necklace in the sand. Soon a search for its owner begins, and a trail of clues leads the children to Tower House. What will the Boxcar Children find in the strange old mansion?"--P. [4] of cover.