It’s late in the day when you find the opening behind a boulder in Snake Canyon. The cave seems darker than you remember it, but you step inside, take a second step, and a third, and you slip and are falling down a chute. Your head hits something, but what matters is that here you are, lying in a field, rubbing your scalp and looking up at the branches of an oak tree and the bright blue sky without any idea of where you are.
Around you is mixed pasture and woodland. Nearby is a narrow dirt road, which disappears over a rise a few hundred yards away. Across the road is a fast-flowing stream.
You hear hoofbeats and a strange clanking...