The Good Daughter by Karin Slaughter

 The Quinn family lives in small-town Georgia. Rusty believes that everyone deserves legal representation so he has helped free a black man wrongly accused of killing a white person and a man accused of raping a woman who later committed suicide. This has not made him popular with the locals. One day, an angry local set his house on fire, causing his family to lose everything. They moved to a ramshackle farm house and picked up a lot of stuff from Goodwill to furnish it with. One night, someone knocked on the door. One of Rusty's daughter's opened it and that's when the nightmare began. They were looking to kill Rusty, who wasn't home, so decided to attack his wife and 2 daughter, Samantha (Sam) and Charlotte (Charlie),  instead.  After that terrifying beginning, the book picks up the action many years later when Sam is a patent attorney living in NYC and Charlie is a lawyer who has stayed in their small town, working out of her father's office. As the story begins, Charlie is a witness to a school shooting that brings back all the horrible memories from her past. 

Be warned that there is a lot of violence in this book. But it's a good story of how the 2 sisters survived their trauma and tried to move on. And there is a good legal thriller in there about the teenage girl who is accused of the school shooting. I kept thinking that Will Trent could have figured it all out, if he had been on the scene, but this is a non-Will Trent book.