Irving's plans to scare his bratty little sister Claire backfire when she drinks his mail-order magic potion and is transformed into a monster.
- ISBN10 0805016422
- ISBN13 9780805016420
- Publish Date 1 March 1991 (first published 1 January 1989)
- Publish Status Out of Print
- Out of Print 1 August 2012
- Publish Country US
- Imprint Henry Holt & Company
- Format Paperback (US Trade)
- Language English