Showing The Traveller Returns by Patricia Wentworth

Anne Jocelyn had been a beautiful, wealthy young woman. She had died three years ago. At least, that was what her husband Philip and the rest of the family had always thought. But then a woman calling herself Anne Jocelyn appeared and managed to convince everyone that she was the real Anne. Everyone, that is, except Miss Silver, whose suspicions are aroused by an apparently senseless murder.