With Cuba on the cusp of change, and a cast of rusty spies ready to retire, a young American arrives. "Gabe Sourdough" looks like a 'turista', but behaves like a man with a bit more on his mind. His suspicious timing rejuvenates the ailing, paranoid revolutionary. His odd movements launch boozing buddies back into opposition. His desires expose the shady lives of a crafty old boxer and a desperate young girl, jeopardizing their fragile survival. Is this "Sourdough" a brash new breed of agent, or something far more threatening to the rule of the regime? As the islanders search for clues to the mysterious traveler's purpose, questions about their own motivations emerge.