Hand of Evil by J.A. Jance

Ali Reynolds comes home to Sedona, Arizona after losing her newscasting job in Los Angeles. While a teenager, she received a college scholarship from the wealthy Anna Lee Ashcroft. When Ashcroft's daughter, Arabella, asks Ali to tea, she doesn't think much of it. However, she gets a quick lesson on Arabella's family history when Arabella recounts the abuse she suffered at the hands of her stepbrother years ago and her nephew Billy's threats to have her declared incompetent now. Ali is also in the process of helping her friend, Detective Dave Holman, deal with his runaway daughter, Crystal. It's enough that Ali has her hands full with both these domestic dramas. Add the disappearance of Ali's father's friend Kip and you have a world of secrets, lies, and murder. Hand of Evil is the third book in the Ali Reynolds series.