Professional gambler Dan Crown arrives in San Juan to visit his brother Alex, only to learn from the police that Alex has been found murdered. To Captain Acosta's questioning, Dan answers that he had no knowledge of his brother's affairs. Dan then finds Gina Rosario searching his hotel room, and together they begin to investigate Alex's death.

Rodolfo quiere casarse con la aristócrata Adriana que lo rechaza. Humberto, hermano de ella, mata por ésta a un hombre. Rodolfo atribuye el crimen al gitano Renzo para que Adriana, agradecida, se case con él. Renzo es enviado a la isla de los condenados, donde lo dan por muerto.