In this caper movie, Keith Carradine, Rip Torn and Tom Waits play a band of fledgling jewel thieves who decide it's time to break into the big time. Their plan? To smuggle emeralds from Mexico to the United States by implanting the gems inside a horse. But their plot quickly unravels when they discover there's a mentally unhinged criminal in their midst. Which one is it, and will the other two be able to make off with the loot in the end?