The Murderer's Daughters by R. S. Meyers
Sisters Lulu and Merry share a terrible past. When Lulu was only a child, she let her drunken father into the family home and watched him kill her mother - and then turn on six-year-old Merry. Years later, clinging to the wreckage of their childhood, the sisters try to make sense of what happened. Bound by their love for each other but divided by private grief, forgiveness comes at a higher price than either could have imagined. The Murderer's Daughters is a gripping and moving story of the ramifications of one violent act and the endurance of family loyalty - even when it is stretched to the very limit.