I slammed the aircar door and fumbled in my pocket for the key. I cast a quick backward glance at the policeman a hundred feet away. He wheeled about at the sound. My trembling fingers tried to fit the key into the ignition. "Halt!" the policeman yelled unlimbering his gun and breaking into a run. My fingers failed to coordinate. I heard a shot and nervously dropped the key. I bent over frantically to scoop it up. There was another shot. Pieces of glass trickled down my neck. I straightened up a