An orphan who's working in a Mansion, falls in love with the owners' son.
Young psychologist Martín Mondragón is contacted by a mysterious man named José Sagasti, who tries to collect an old debt that Martin's grandfather left when he died. Rivera, being the first male descendant, is the most suited guarantor to pay off the debt, which consists in giving his soul to the devil by dropping a bit of blood from an old parchment.
