I raced across the Arizona desert as if my life depended on it. It probably did. I wove around thorny bushes and towering, saguaro cactus. Just ahead of me was the safety of a rocky hill. My pounding feet churned up little, red dust clouds as I put on a burst of speed. I leaped onto the bedrock and landed with a solid thunk. That's when the ground gave out from underneath me.
There was a terrifying moment of vertigo as I plummeted into darkness. The slabs of rock underneath me crashed to the floor of a cavern and shattered. An instant later, my body slammed into the rubble, the fall cushioned only by my backpack.
Stars exploded inside my skull and blotted out everything. Blind with pain and choking on dust, I rolled onto all fours. I struggled to stand, but my legs refused to stay under me. I crumpled against the cave wall, kneeling with my hands and face pressed against the cool stone. I waited to catch my breath. Eventually the pain subsided, and my ears stopped ringing. Then, braced for the worst, I looked up. Yep, Joe was glaring down.