The Final Judgement by Richard North Patterson

A young man is brutally murdered. His distraught girlfriend is the prime suspect. Her aunt, Caroline Masters, about to take up a top job in the US Court of Appeals, decides to defend the young woman in the murder trial. But this will be Caroline's first contact with her family in almost twenty years, and as she prepares the case and goes through the trial, long forgotten secrets re-surface, pitting Caroline against not only the police and prosecution, but also against her father (a retired judge), her sister and the memory of her young self when she, too, lost a boyfriend in suspicious circumstances. The Final Judgement is a powerful, poignant, page-turning legal thriller that confirms Richard North Patterson as among the very best writers in the bookselling area.