Although recently fired from his job as a Wyoming game warden, Joe Pickett (In Plain Sight ) is asked by the governor to investigate an officially closed multiple murder case in Yellowstone National Park. Four campers were gunned down by a lawyer who escaped conviction via a loophole. Knowing full well that federal agents and the National Park Service will not want him poking around, Joe stirs up trouble nonetheless with Nate Romanowski, still wanted by the FBI for questioning in a number of unrelated crimes. Their surprise discoveries in Yellowstone quickly escalate into a dangerous situation. Box, winner of the Anthony, Macavity, Gumshoe, and Barry Mystery awards, knows how to turn on the nail-biting suspense and violence until the cliff-hanger of an ending. Fans of outdoor action mysteries by such authors as Steve Hamilton and William Kent Krueger will snap this up. Highly recommended. Box lives outside Cheyenne, WY. [See Prepub Mystery, LJ 1/07.]