Twelve-year-old Orville and his friend Derrick form their own detective agency and, with help from Orville's younger sister Chloe, investigate the arrival of an unusual letter and the appearance of a mysterious intruder.
- ISBN10 0399226648
- ISBN13 9780399226649
- Publish Date 19 April 1995
- Publish Status Out of Print
- Out of Print 17 March 2021
- Publish Country US
- Imprint Putnam Publishing Group
- Format Hardcover
- Pages 94
- Language English