Title: The Disappearing Staircase Mystery
Description: When the Alden children join a group of volunteers to fix up an old house for senior citizens, they try to explain the puzzling behavior of their coworkers as well as investigate some unusual events.
Subjects: Buildings, Charity in fiction, Brothers and sisters, Repair and reconstruction, Orphans, Buildings in fiction, Fiction, Brothers and sisters in fiction, Auctions, Orphans in fiction, Mystery and detective stories, Auctions in fiction, Charity, Detective and mystery stories, Mystery fiction, Siblings, Juvenile literature, Children's fiction, Orphans, fiction, Brothers and sisters, fiction, Auctions, fiction, series:BoxcarChildren, collectionID:Boxcar3, Siblings, fiction