The Invisible Boarder — Mildred Davis

When Norma Boyd first decided to return to Freetown, she had been sure no one would recognize her. She'd lived in the town only a month, had spent most of her time getting settled, and the tragedy had happened four years earlier. Now she was back less than a week and was confronted by someone who looked familiar.

Four years before, her small son had wandered off, and it had been days before his lifeless body was found. She had come back to find his murderer. The police had given up the search, but in her mind she never had.