The War on Terror grinds slowly forward. Gavin Wallace does his part, serving with his National Guard unit; performing his tedious, dangerous duty in the hot gritty deserts and dirty streets of Iraq.

An eighteen-foot grizzly bear figures out that humans make for a tasty treat. As a park ranger tries rallying his men to bring about the bear's capture or destruction, his efforts are thwarted by the introduction of dozens of drunken hunters into the area.

Intent on seeing the Cahulawassee River before it's turned into one huge lake, outdoor fanatic Lewis Medlock takes his friends on a river-rafting trip they'll never forget into the dangerous American back-country.