Five friends returning from a marriage in Canada return home to the United States. Not far from the border, two customs officers stop them to check their identity. Suspicious, they take their time especially with Jalil, a man of Arab origin. The situation worsens when a customs officer finds a small bag of marijuana in the luggage. Then things degenerate rapidly: a customs officer grabs the little dog that's part of the group and slits open its belly to be sure it's not a mule. When Gab makes a move, he's shot. The customs officer orders the surviving friends to undress and put on orange coveralls. Gradually, it dawns on the four tourists that they are in the hands of former torturers from Guantanamo.

Walrus-like warden, Sven "Swede" Sorenson, a cross between Bluto and Wimpy, runs the prison, murders convicts who escape, and has the FBI on his trail in the form of agent Karen Polarski, the daughter of the town's corrupt judge. Swede's twins tell their father they're pregnant (they aren't), so he pushes their dim boyfriends, Bud and Larry, into shotgun marriages. He also turns his sons-in-law into slave labor, so Bud hatches an escape plan: to rob a train carrying old bills to the mint for burning. Larry's his reluctant accomplice. When Bud is captured and railroaded into Swede's jail, his death looks certain, until he hatches yet another plan that requires Larry's help.