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The Alden family is spending sunny days at the shore and summer nights in the mobile home right on the beach....

Benny and Henry are working all summer at Furman’s, the biggest store in town, but they hadn’t expected that solving mysteries would be part of their job....

The Aldens are excited to visit a deserted South Seas island. But soon they discover clues that they are not alone. Is someone on the island watching them....

Three complete stories in one collection! Includes The Woodshed Mystery, The Lighthouse Mystery, and Mountain Top Mystery....

Three stories in one collection! This volume includes The Amusement Park Mystery, The Mystery of the Mixed-Up Zoo, and The Camp-Out Mystery....

The Aldens spend the summer on their own private island. There they meet a new friend with an amazing secret....

The Aldens are helping out at the Greenfield Ice Cream Barn. But they soon notice that the ice cream isn’t the only thing getting mixed up at the Ice Cream Barn....

Three complete stories in one collection! Includes Mystery in the Sand, Mystery Behind the Wall, and Bus Station Mystery....

This volume includes: The Animal Shelter Mystery, The Old Motel Mystery, and The Mystery of the Hidden Painting....

When the Boxcar Children help out in a local garden, they dig up one strange thing after another! First, the tomato plants seem to move every day. How can that be? Find out....

The Aldens are bound for the Science and Hobby Fair, but when a bad storm hits, they’re forced to stay in the bus station....

The Aldens have found a mystery under their very own roof! When the children found an old journal behind the closet wall in the guest room, they never dreamed it would lead them on a search for valuable coins. What happened to the girl who wrote the journal—and what is she trying to tell them?

Three complete stories in one collection! Includes The Summer Camp Mystery, The Copycat Mystery, and The Haunted Clock Tower Mystery....

The Aldens are making the journey to their Aunt Jane’s house on an overnight bicycle trip. But on their first night, the children are caught in a rainstorm and have to take shelter in an old, abandoned house where a most unusual mystery—a lost dog—finds them!

The Alden children are helping their neighbors build a tree house. From the tree house, the children discover they can see into the attic of the house next door....

It’s an unusual winter vacation for the Alden family when a huge snowstorm traps them in the woods! Luckily, the log cabin where they’re staying is cozy—only there are strange noises in the night and a mysterious code carved into the closet door.

When the Aldens spend the summer riding on a train, they get to live in a train car once again—this time, they're staying in Caboose No. 777. The number is hard to forget, and indeed, the children meet people at each stop who seem to know it well.

When the Aldens take a summer trip to the New England coast, they have a fun place to stay: a lighthouse! But strange things happen after it gets dark.

The Alden children are staying at the New England farmhouse where their grandfather grew up. There are many stories and legends about the old farm....

The Aldens are spending the summer traveling on a houseboat! Throughout their journey, the children have the feeling that they’re being watched.