The Fortress
| First published | 1989 |
|---|---|
| Series | Spider World › The Tower #3 |
| Publisher | Ace Books |
| Format | Paperback |
| Type | Novel |
| Cover art | Luis Rey |
| Pages | 149 |
| Price | $3.50 |
| ISBN | 0441778135 |
- "Ace edition/July 1989"
- First printing as per the number line: 10 9 8 7 6 5 4 3 2 1
- Artist from the source of the image