A posthumous letter referring to buried treasure convinces Gary that his grandfather did not die a natural death and, with his friend Brian, he sets out to find both the treasure and his grandfather's killer.
- ISBN10 0808552449
- ISBN13 9780808552444
- Publish Date 1 May 1989 (first published 1 June 1985)
- Publish Status Out of Print
- Out of Print 7 April 2021
- Imprint Turtleback Books
- Edition Turtleback School & Library ed.
- Format Hardcover (Library Binding)
- Language English