A Delve in the Cave

From publisher blurb: Something lurks in the shadows inside the caverns under the hill called Brin Brenin. Ancient enemies of mankind have returned for revenge, starting with the tomb of a long-forgotten hero. Somewhere inside are answers to forgotten questions, deadly monsters, and hidden treasures. This adventure contains everything needed to run a group of four or five 1st-level characters through the scenario in one to three sessions of play using the 5th Edition rules of the world’s original fantasy roleplaying game!