Daddy's little girl - Mary Higgins Clark

Ellie Cavanaugh was only seven years old when her fifteen-year-old sister, Andrea was murdered. Ellie's testimony was vital to the conviction of Rob Westerfield, son of a wealthy, prominent family.
Twenty-two years later Ellie remains convinced of Westerfield's guilt. When he is released on parole and attempts to prove himself the victim of a miscarriage of justice, Ellie begins work on a book she believes will prove Westerfield's guilt beyond doubt. As she delves deeper into her research, she uncovers horrifying facts that shed new light on her sister's murder. And with each new discovery she comes closer to a confrontation with a desperate killer. . .