When Grandfather's friend bought Skeleton Point, she invited the Alden children to help her fix it up. But this empty mansion is even spookier than it looks. The man who used to live there studied bones — but the house is filled with skeletons! Then, the mansion's valuable statues begin to disappear. Could the Skeleton Point ghost be causing mischief?

The Aldens visit their cousins Joe and Alice, who live near an amusement park! The park has games, cotton candy, and a beautiful old carousel with wooden horses. But then Benny notices one horse isn't working and his favorite dapple gray has been damaged. Why would someone sabotage the carousel?

The Aldens are helping save an old library that's about to be torn down. If they fix it up, it might be given landmark status! But after all their hard work, it's very clear someone is trying to destroy the library. But who?

Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and they're fixing up their boxcar so they can ride it in the big Greenfield Founder's Day parade. There's just one problem: Someone has stolen the boxcar . . . with their dog, Watch, in it! If only they can find the missing boxcar, it will lead them to Watch. Can the Boxcar Children solve their most important mystery ever?