Larger	The Disappearing Staircase Mystery (Boxcar Children Mysteries #85) Author: Gertrude Chandler Warner
	Book Information Publisher: Scholastic Book Type: Paperback Rating: 2 ISBN-13: 9780439240970 - ISBN-10: 0439240972 Publication Date: 1/2001 Pages: 115 Reading Level: Ages 9-12

The Alden children are helping the Heart and Hands volunteer group fix up the old Bugbee Mansion for senior citizens. While exploring the mansion, the children discover hidden rooms, hear odd noises coming from the walls and try to explain the puzzling behavior of their coworkers. Most intriguing is a secret staircase, leading to a room that no one knows about—no one except the thief!