Last Breath von Karin Slaughter

At the age of thirteen, Charlie Quinn's childhood came to an abrupt and devastating end. Two men, with a grudge against her lawyer father, broke into her home - and after that shocking night, Charlie's world was never the same. Now a lawyer herself, Charlie has made it her mission to defend those with no one else to turn to. So when Flora Faulkner, a motherless teen, begs for help, Charlie is reminded of her own past, and is powerless to say no... The fantastic prequel to "The Good Daughter".