When their favorite pizza restaurant almost goes out of business, the Alden children try to help their friends stay open while they find out who is behind all their problems.

The Alden children investigate when Mrs. Murray's jewels are stolen during a party for the Starlight Skating Troupe.

Henry, Jessie, Violet, and Benny discover the fun in geocaching as they make new friends and search for hidden boxes around town, but the group soon begins to suspect that one of their new friends may be a thief.

While helping out part time in a pet shop, the Alden children discover an employee who is smuggling and selling exotic animals.

"The Aldens are on a special vacation up north to see the Calgary Stampede--a cowboy celebration of Canada's frontier spirit! There's a parade through the streets of Calgary, a spectacular stage show, and plenty of fun things to do. But behind the scenes at the festival, an important piece of jewelry goes missing. Can the Boxcar Children find the thief before the big show is ruined?"--Jacket flap.

The Alden children solve a mystery and find long-lost treasure which belongs to an old Indian woman.

At an old library, the Alden children discover a boy who needs their help and a stranger who is after a valuable object they found in the library.

The four Aldens take shelter in an old abandoned house during a rainstorm while on a bicycle trip to their Aunt Jane's house when a lost dog finds them.

During a trip to Oregon, the Aldens are astonished when Watch discovers a backpack filled with valuables, a finding that compels them to learn what happened and return the backpack to its rightful owner.