City cops face prohibition bootleggers, gangster gamblers, and get complaints about this loud new "jazz" music. But up at Rocky Mountain National Park, Ranger McIntyre has nothing to do except eat breakfast, go fishing-and solve a couple of possible murders. One is an amateur mountaineer found hanging from his own rope on Flattop Mountain. The other, a geologist studying stones on Flattop, somehow ingested a poison plant. Both deaths could be accidental-except...