When Things Fall Apart by Alan Brenham

Newly minted homicide detective Kit Hanover is paired with a crusty veteran who makes no bones about his feelings for Native Americans. Their prickly partnership becomes more antagonistic when her first murder case proves devastating and she is reassigned. Determined to work the case in her own time despite the emotional consequences she finds herself and her family the target of an unknown madman. She withstands the inexplicable attacks as she continues her investigation until she finds herself face to face with the murderer. Only one of them can survive.