Fiona’s timer read 40 33 04 21 53 08. Years, weeks, days, hours, minutes, seconds. Her first girlfriend had done the math one day in bed. “You’ll be sixty-four when you meet your soul mate. I’ll be twenty-two,” the girl said with a gesture that revealed her frail, luminous wrist, which was lit from within, like a lightning bug. Fiona watched her own timer tick down through her girlfriend’s hair, feeling as though she were trying to catch up to the world.