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.
"Henry, Jessie, Violet and Benny Alden discover that a mystery surrounds the run-down yellow house on Surprise Island. The children find a letter and other clues that could lead them on the trail of a man who vanished from the house"--P.  of cover.
The Alden children travel on a Mississippi paddle-wheel steamer to visit an old family friend in his cabin near Hannibal, Missouri, and try to discover who is responsible for the mysterious activities near the house.
"The Aldens are having a delicious time helping out at a pizza parlor! They toss dough in the kitchen and even invent a new kind of pizza. But when a blackout and other problems hurt business, they begin to wonder if someone is trying to shut down the pizzeria. It's piping hot mystery for the Boxcar Children!"--P.  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.  of cover.
"Henry, Jessie, Violet, and Benny Alden are going to climb a mountain! The hike up Old Flat Top is only supposed to take a day, but a dangerous rockslide changes everything. The rockslide reveals a hidden cave that just may hold a legendary treasure. Can the boxcar children solve the mystery of what's on top of the mountain?"--P.  of cover.
"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.  of cover.
"The Aldens are making the journey to their Aunt Jane's house for an overnight bicycle trip. On their first night, though, they're caught in a rainstorm and have to take shelter in an old house. There, a most unusual mystery--a lost dog--finds them! What can the Boxcar Children figure out where the dog belongs?"--P.  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.  of cover.