Thomas would have noticed the girl anyway, as she threaded her way between the sun-sodden families and couples who lay melting on the pebbly beach. Even from where he was sitting, he could see her dress was made from some wispy stuff the colour of Parma Violets. It skimmed the contours of her slight figure, making her appear as unsubstantial as the dress itself. He couldn't make out her shoes very well, except they seemed to have very high heels, but she was miraculously sure-footed among the bathers who stumbled…