City cops in the 1920s deal with prohibition, gangsters, loud jazz music. In Rocky Mountain National Park, Ranger McIntyre has to solve a couple of odd murders. An amateur mountaineer died hanging in his own rope on Flattop Mountain. A geologist studying stones on Flattop, ingested death camas. And a pair of odd-looking creatures on the mountain keep adding new rocks to Flattop's ancient aboriginal stone circle. McIntyre's friend is Vi Coteau, an FBI secretary in Denver, independent as an alley cat and lip-smacking gorgeous. She wants him to learn backcountry camping. McIntyre planned to go search for the source of the strange stones that are being added to the medicine circle. If he took Vi with him, it would be more of an adventure. More adventure in more ways than a backcountry ranger might imagine.