Mark Trail has always been an action hero, and the longer and elaborate story lines are fun. “Mark Trail” is also highly educational and reminds readers about the wonders of our natural environment, which is under ever-increasing assault by humans. The use by “Judge Parker” of sudden, devastating natural disasters such as a sinkhole is not only realistic but also clever and rather cool. Such phenomena change lives instantly and provide surprises and interesting obstacles to overcome. In today’s quest for action and excitement, what’s not to like?