It's oddly comforting that the only lazy or derivative thing about James Lee Burke's 21st novel featuring tough-guy New Orleans sheriff's detective Dave Robicheaux is its title; there's no good reason why this latest book should be called simply Robicheaux – or alternately, no good reason why any of the previous 20 couldn't have been called that; it feels like the title you'd give the final book in your series, the one in which your hero finally heat-shots and throat-punches his way to Valhalla.