Santo is called in to stop robot terrorists from sabotaging oil supplies in Puerto Rico.
In a New York hospital, a man is cured of heroin addiction after a grueling three-month treatment. Although no longer an addict, he has complete amnesia: the only clues to his past are an expensive ring he was wearing when admitted, and a book of matches from a Puerto Rican nightclub. He pawns the ring and buys clandestine passage on a boat to Puerto Rico in search of his identity.
The film, which is an ode to Rafael Hernández's song "Lamento borincano", is a social commentary of the political and social policies of the 40's and 50's which led to the abandonment of what was seen by many as the "pure", "virtuous" life of the finca (farm) for the "corrupting" influence of urban centers like San Juan and New York City.
