Accused (Rosato & DiNunzio Series, Book #1) by Scottoline, Lisa - 2013

Mary DiNunzio, who just made partner at Rosato & Associates, takes on her most unusual case yet, brought to the firm by Allegra Gardner, a thirteen-year-old genius from an extraordinarily wealthy family. Allegra's sister, Fiona, was murdered six years ago, and it seemed like an open-and-shut case: the accused, Lonnie Stall, was seen fleeing the scene, his blood was on Fiona and her blood was on him, and most damning, Stall pleaded guilty. But young Allegra believes Stall is innocent and wrongly imprisoned, and wants to reopen the case -- of her own sister's convicted killer. The powerful Gardner family and Allegra's parents oppose reopening the case, so taking it on is risky. But Mary and Rosato & DiNunzio can never resist an underdog. Was justice really served all those years ago? It will take a team of unstoppable female lawyers, plus one thirteen-year-old genius, to learn the truth.