Death in Autumn — Magdalen Nabb

They found the body in the river just as dawn was breaking over Florence ...

The dead woman was wearing a lot of rings, a, large bracelet, elegant earrings--and underneath her expensive fur coat she was absolutely naked.

At first, it seemed like a bizarre suicide. But why didn't anyone come to claim the body or report a missing wife, mother, or friend? Following a complicated trail of blackmail, jewel theft; and drug dealing, Marshal Guarnaccia finally ferrets out the shocking truths about a very cool-headed murderer and his all-too-trusting victim.