From publisher blurb:
You Are Invited to a Little Mayhem
The Master of Demon Mountain is notorious for his strange customs--and his vast wealth and power, concentrated in a fabled keep perched on a mountain overlooking the Rothenian plain. The problem? The wine merchant Korsav’s finest bottle of wine was stolen by his bitter rival--the son of the Master of the Demon Mountain. Korsav convinces the PCs to help him embarrass his rival, by spoiling wine that will be served at a dance the Master is throwing for his daughter. He will pay handsomely for their trouble, and tiny bit of discretion.
The PCs will have their first brush with danger in the caravan as they approach.... And then the mayhem begins!
Mayhem Beneath Demon Mountain is a fantasy adventure by Chris Lozaga suitable for four 3rd level PCs near any mountain (and especially a lonely mountain on the plains). It includes a little stealth, roleplaying, and horrific dungeon elements.