From the introduction:
Seeking food, shelter and/or medicine, our heroes approach the town they have seen sparkling in the distance from the cave. After appeasing the town guardians and entering the town, they are taken to see the Mayor of Hamilton. The mayor is actually the town doctor, kindly known as Doc. The inhabitants of the town are not entirely trusting of an armed band in their town, but are generally good people who wish to be helpful. After a quick tour, the characters are made an offer. Since the PC's are obviously somewhat down on their luck, the people of Hamilton will outfit them with food and water, ammo for their weapons, medicine (poison cure(s) if needed), etc. if the players will do them a favor. Hamilton is built on the remains of a military base established by the ancients. Underneath the town is a tunnel complex. Since the town has only recently been re-established, the entire tunnel complex has not been explored. One of the town resident's young son is lost in the tunnels. If the PC's will explore them, clear them, and save the boy, they will be equipped for further adventures.