Former best friends Scott and Errol meet unexpectedly at Oso Lake, a remote Canadian fly-fishing paradise where, five years before, fresh out of college, they had the time of their lives. Their situations, though, have changed, their high hopes quashed by workaday realities and, in Errol's case, marriage to Claire, who has come with him trying to stave off divorce. But Oso Lake has changed. The fall before, a woman's severed head was left in a campfire pit beside the lake. The shadow cast by her murder is darkened further by a fire-scarred white truck driver who claims to be a long-dead Native shaman and has plans to eradicate not only Scott, Errol, and Claire, but all of Western civilization. The beauty of the wilderness becomes, every day, more threatening and perverse. But the worst danger the vacationers face may be themselves.