Arnie's invisible friend Trigwater gets him into all sorts of trouble until Arnie decides to make him behave.
- ISBN10 0688080588
- ISBN13 9780688080587
- Publish Date 1 January 1989
- Publish Status Out of Print
- Out of Print 12 November 2014
- Publish Country US
- Imprint Morrow Junior Books
- Format Hardcover
- Pages 31
- Language English