From the back cover:
"DIMENSIONAL VORTEX!
Not long ago, a magical vortex released into the lands of Thunder Rift a strange and haunted ship from another time and place. A cursed ship, bad luck for those who see it.
The party never wanted to see the ship, much less board it. However, the mystical astrolabe they found must have had great power - at least enough to send them here. Too bad it's missing, now. Will the heroes find a way off the haunted ship, or are they doomed to sail strange seas forever?
- Recommended for four to six characters of third to fifth levels
- Can be played with or without a DUNGEON MASTER
- Includes: New Magic, Color Poster Map, Monster Stand-Ups, and an Easy-To-Follow Format
- This module can also be played with the ADVANCED DUNGEONS & DRAGONS(R) 2nd Edition rules
- For use with the DUNGEONS & DRAGONS Game Box