Murder...Then And Now" by Penny Mickelbury, in Send my Love and a Molotov Cocktail, PM Press, 2011.
My favorite tale starts in the sixties when five Black college students in the south are planning to disrupt a KKK parade with molotov cocktails. Things go disastrously wrong.
Forty years ater the survivors of the debacle meet to determne what happened... and to settle the accounts. As it happens, one of them is a private eye, Boxer Gordon. While not a traditional private eye story at all, this is still the best P.I. tale I have read so far this year.