"k" Is For Killer by Sue Grafton

Lorna Kepler's mother hires Kinsey Millhone to investigate the death of her daughter who, she is convinced, was murdered. Kinsey takes a different tack on this investigation, becoming frustrated when Danielle, her friend and informant is brutally beaten. She is given the opportunity to exact revenge. Will she do it? Read "k" to find out. Another good one. Sandy P