Two kids visit their school after dark and find it occupied by the entire population of Sillyville.
- ISBN10 0679802886
- ISBN13 9780679802884
- Publish Date 20 February 1991
- Publish Status Remaindered
- Out of Print 2 October 2008
- Publish Country US
- Imprint Alfred A. Knopf Books for Young Readers
- Format Hardcover
- Pages 32
- Language English