From the publishers blurb:
Blovar Thistletine, a wealthy halfling, decided recently to remodel the wine cellar in his summer home. Work progressed well for a few days until the crew arrived one morning to find a tunnel had mysteriously appeared in the floor of the cellar. The crew tied a rope to one of the workers and lowered him down the shaft to explore. A few minutes later, they could hear the poor worker’s brief scream of agony and the rope went slack. All they recovered when they pulled up the rope was a charred end. The workers refused to continue their work. Mr. Thistletine is offering a handsome reward for a party of adventurers to explore the shaft and eliminate any threats to his beloved wines.
A Castles & Crusades adventure for a party of 4th to 6th level PCs