Midway of the Ponte Vecchio at Florence, where three arches break the lines of the little jewellers' booths glittering on either hand, and open an approach to the parapet, Colville lounged against the corner of a shop and stared out upon the river. It was the late afternoon of a day in January, which had begun bright and warm, but had suffered a change of mood as its hours passed, and now, from a sky dimmed with flying grey clouds, was threatening rain.