ONE Michael Trehearne was to remember that evening as the end of the world, for him. The end of his familiar life in a familiar Earth, and the first glimmering vision of the incredible. It began with the man who spoke to him on the heights behind St. Malo, by the light of the Midsummer Fires. There was a great crowd of tourists there, come to watch the old Breton festival of the sacred bonfire. Trehearne was among them, but not of them. He stood alone. He was always alone. He was thinking that t