John Denson, private investigator, goes to Oregon's North Umpqua River to fish trout but, instead finds himself caught up in a net of international intelligence agents and academics. It all starts when the naked body of a girl with a bullet hole between her eyes goes rushing past Denson in the rapids. He embarks on a search to find the girl's identity and bring her killer to justice. Strange clues lead to three more corpses, bringing the body-count to four and only the Siskiyou Two-Step saves Denson from being the fifth...