The set consists of a 128-page booklet titled Campaign Guide to Undermountain, a 32-page booklet titled Undermountain Adventures, 8 double-sided loose-leaf monster statistics pages, 8 double-sided heavy-stock "adventure aid" cards, and 4 color fold-out poster maps.

The book also keys the maps to what can be found in various locations and contains expansion guidelines for creating future adventures and deeper parts of the dungeon.

[1] The entire Ruins of Undermountain is purported to be the "deepest dungeon of them all" with nine levels and fourteen sub-levels.

The monster sheets detail 11 monsters in the Monstrous Compendium style: elder orb beholder, death kiss beholder-kin, darktentacles, ibrandlin, scaladar, sharn, slithermorph, flying snakes (flying fang and deathfang), steel shadow, and watchghost.

[3] Keith Eisenbeis reviewed the module in the February 1992 issue of White Wolf Magazine.