From publisher blurb:
An adventure in Hyperborea designed for from four to six characters of 6th through 9th level
For weeks the Comet has blazed in the sky above Hyperborea, inspiring widespread superstitious dread and fear of some star-borne contagion. Under the light of this harbinger from the Black Gulf, the PCs have come to Bogrest, following a magical treasure map that reveals great wealth buried in the Lonely Heath north of the village. Finding that treasure will be no simple matter, however, for Hyperborea is a weirder and deadlier place than ever beneath the Comet.
Beneath the Comet takes players into an action-packed realm of adventure: the mythical world of Hyperborea, a sword-and-sorcery campaign setting inspired by the fantastic fiction of Robert E. Howard, H.P. Lovecraft, Clark Ashton Smith, and others. This adventure is designed for Astonishing Swordsmen & Sorcerers of Hyperborea (AS&SH), a role-playing game descended from the original 1974 fantasy wargame and miniatures campaign rules as conceived by E. Gary Gygax and Dave Arneson.