Trouble at Karst Cavern

From publisher blurb: This is a short encounter set intended for a HackMaster (current edition) GM running for 3rd(ish) level PCs. The design is deliberately vague in several areas to make it easy to "tweak & toss" into your current campaign, even if you don't play HackMaster! It is intended to print this file two-sided and fold in half, zine-style.