Kill and Tell by Linda Howard

Karen Whitlaw, still grieving for her mother, receives a package with no return address for her from her father whom she hasn't seen for many years. Formerly a sniper during the Viet Nam war, he now has a dangerous secret. In the meantime, Karen sells the house and moves into an apartment closer to her work. When her father is murdered in New Orleans, events occur that connect the dots to another murder and two attempts on Karen's life. Pretty exciting, moves right along. Love interest with hunk Detective Marc Chastain makes Karen appreciative of the south. Sandy Penton