LATER than usual one summer morning in 1984, Zoyd Wheeler drifted awake in sunlight through a creeping fig that hung in the window, with a squadron of blue jays stomping around on the roof. In his dream these had been carrier pigeons from someplace far across the ocean, landing and taking off again one by one, each bearing a message for him, but none of whom, light pulsing in their wings, he could ever quite get to in time.