From the back cover:
Derro swarm in the Abbor-Alz. The Doomgrinder windmill's blades approach their zenith. Strange sightings in Hardby and rumors of a bandit empire in the mountains have commoners and nobles concerned. The Circle of Eight hopes that the key to averting this disaster can be found in the mysteries of a group of five ancient crypts, the Star Cairns. But first someone has to find the fifth cairn. . . .
Five separate adventure sites playable individually or linked together, The Star Cairns can provide a diversion for treasure-hungry adventurers—or can be used as the seeds for an extensive campaign. Although the adventures are designed for four to eight characters of levels 5–8, each section can be adjusted for weaker or stronger groups.
The Lost Tombs series continues with The Crypt of Lyzandred the Mad (Voume 2) and The Doomgrinder (Volume 3).