the picture of percy , dark-eyed and smiling , thumb running over the surface of his wineglass as though he stroked grey 's prick , saying casually , `` i married one of the sisters of the baron amandine ... '' `` one of the sisters , '' grey whispered aloud , and the dream crystallized in his mind , the sense of cold from the stones of trois fleches so vivid that he shivered , though the night was not cold at all .