- ISBN: 080755491X, 9780807554913
- Page count: 128
- Published: 2001
- Format: Paperback
- Publisher: Oasis Audio
- Author: Gertrude Chandler Warner
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.