- ISBN: 080755538X, 9780807555385
- Page count: 128
- Published: 2003-01-01
- Format: Paperback
- Publisher: Oasis Audio
- Author: Gertrude Chandler Warner
The Boxcar children are attending an Invention Convention at the home of an eccentric artist known for her one-of-a-kind clocks. The clocks sound loudly at every hour. But the clocks aren't the only noise the kids hear at midnight.