The rural American equivalent of a police procedural involves much more driving than the British standard book, plus a far more free-wheeling set of processes. I enjoyed joining Chief Detective David Wolf on his thirteenth outing. “Divided Sky” plonks Wolf into a baffling murder involving a former sheriff and his estranged nephew, and soon a busy cast of suspects, relatives, and cops is entangled. The pace is fast, the writing is smooth, and the western mountain locales are evocative, but Wolf remains a trifle bland and the endless repartee can wear. Nonetheless, a sprightly one-sitting read that will entertain many readers.