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The Boxcar Children try to find out who's responsible for causing some trouble at Edward Marlow's zoo.

When the Aldens' explore Dragon's Mouth Cavern, they encounter some suspicious people.

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 mountain climbing in New England. A dangerous rockslide, a mountain cave, and a secret treasure are a few of the adventures in store for the boxcar children!

When the Aldens visit their friend Fran in Wisconsin, they can't wait to hear her tell the story of the runaway ghost. Fran's family ghost hasn't been spotted in years. Then Violet hears a mysterious ringing in the middle of the night. Could the runaway ghost be back? Illustrations.

The Aldens try to crack a secret code so their friend can inherit millions of dollars.

The secret staircase in old Bugbee Mansion leads to a room no one knows about--no one but a thief.

Someone tries to stop the Boxcar Children and Grandfather from competing in the bicycle race.

When Grandfather's friend Seymour Curtis invites the Alden family to spend some time at his apple orchard, Benny is determined to find the ghost rumored to haunt the premises. Yet, it seems as if the Aldens may have a more earthly crime on their hands. Illustrations.

The Aldens get to be in a documentary about the Alamo--if the film gets made.

Someone steals an original piece of music by Mozart.

Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and are spending their winter vacation at Snow Haven Lodge.