The Disappearing Staircase Mystery
Book Number: 85
Publication Date: 2001
Plot Synopsis:
The Boxcar Children are helping the Heart and Hands group fix up the old Bugbee Mansion. The Aldens begin to explore the mansion, discovering hidden rooms and odd noises coming from the walls. Most intriguing is a secret staircase, leading to a room that no one knows about—no one except the thief!