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A Keystone Adventure — by Jim Prentice
The Keystone Series in Order (2 Books)
| Order | Book | Date | Rating | |
|---|---|---|---|---|
| 1 | The Mysterious Disk | May-1991 | 0 |  |
| 2 | Fly into Danger | May-1991 | 0 | |
Frequently Asked Questions (FAQ)
There are 2 books in the Keystone series.
The Keystone series does not have a new book coming out soon. The latest book, Fly into Danger (Book 2), was published in May 1991.
The first book in the Keystone series, The Mysterious Disk, was published in May 1991.
The Keystone series primarily falls into the Action Adventure genre.