From publisher blurb:
Grinding Us is a gruesome OSR module marking the 10th-anniversary of Grinding Gear (2009) and the fifth-anniversary of Forgive Us (2014), both published by Lamentations of the Flame Princess. It has been designed for use with LotFP, but is easily adaptable to other OSR systems.
The Tenebrous Hand has set up base at the famed Grinding Gear inn. The Hand, a thieves' guild, lures candidates into their very own death trap, so as to determine who is worthy of working with them. Most end up caged, or turned to stone, or with their hands severed, or demented, or even dead. Those who make it out alive are hired and rewarded accordingly.
Will your party prevail?