María Gentil Arcos

An unstable young woman escapes from a reformatory for very, very wayward girls and deceptively finds shelter in the kind home of a frighteningly nice and decent family. Little by little, she causes unrest and discord among the members of the household, until they are virtually fighting with each other. (imdb)

Angelina Campos, wife of a politician, enters prison accused of murdering Alberto, a man who was his boyfriend in another time and tried to blackmail her. In prison she mets Dora, Alberto's lover, who hates her and continuously harass.