When the graves of two men are discovered on Sphinx Mountain, Sheriff Martha Ettinger suspects murder. But with the only evidence a hole in a skull that might or might not have been caused by a bullet, she turns to a private investigator for help. Stranahan already has a case, having been hired by a group of eccentric fly fishermen to find a valuable fly that they suspect has been stolen. Could the disappearance of a vintage Gray Ghost from a Madison Valley riverside cabin be connected to the gray ghosts who haunt Sphinx Mountain?