I parked my Americar beside the Dumpster in an alley just off Randall Avenue, swiped my keycard through the maglock on the back door, and climbed the narrow staircase to the second floor. I approached the door to number 5 and looked for the telltales I'd put in place when I'd left. All were where they were supposed to be. Again I waved my keycard, then thumbed the secondary maglock I'd installed the day after I'd moved in (right thumb, of course). The circuitry hummed for an instant as it decided whether I was me. Then the bolt snapped back and the door swung open.