From publisher blurb:
This is the eighth installment of the brochure adventure series. Following the same train of thought of the one-page dungeons, these are system-neutral and easy to adapt to any system.
In this adventure, the characters learn of a profitable mining operation that has been stopped after a tragedy occurred. The mine is home to strange arcane-irradiated gemstones that first lured the greedy dwarves into exploring the area. Alas, the strange magical energies caused the baleful polymorphing of three dwarves into a three-headed troll. The monster quickly became a deadly danger to everyone near the mine. Fueled by greed, the overseers now offer a hefty reward to valiant adventurers willing to delve into the mine to get rid of the monster.