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...