LAST CAR TO ELYSIAN FIELDS by James Lee Burke

Veteran Louisiana Detective Dave Robicheaux finds himself in New Orleans, out of district, investigating the brutal beating of his friend Father Dolan, a controversial RC priest. However, another crime closer to home, the deaths of three teenaged girls in a car crash, leads to a series of revenge killings. Putting his own safety on the line, Robicheaux clearly understands the complicated nature of grief as he seeks to balance the scales of justice.