A young biology student at the University of Puerto Rico reveals his sexual orientation to his wealthy San Juan family by wearing a diamond earring in his left ear at Sunday dinner. In addition to confronting them with their prejudices, he unexpectedly revives a secret crime of passion that involved his paternal grandfather. Fascinated, the young man fantasizes the story of his grandfather's love and develops a unique emotional bond that leads him to research the genetic causes of homosexuality - and to startling discoveries.