More than just a fly-fishing film, Only the River Knows delves into the minds of two fly fishermen in an authentic, humorous film shot mostly on the fabled Lethe River on New Zealand's South Island. The two fly anglers lose their way and stumble across the long-lost journal of an iconic fly fisherman. As the main character becomes obsessed with the journal, his partner chronicles their attempt to catch the river's abnormally large trout. 84 minutes. DVD.