Maybe a 3.5? Not the best-written mystery I've read, but adequate. It drops enough references to the first novel with the same protagonist, [b:Black Water Rising|6214113|Black Water Rising|Attica Locke|https://d.gr-assets.com/books/1327883835s/6214113.jpg|6394686], that I probably will read that soon while it's all fresh in my mind.