Las Islas Marias stars Pedro Infante as a man who must face time in jail, even though he never committed the crime. While on the inside, he learns important life lessons that actually make him a better man.
El Pichi, El Trompas and El Orejas are street children who pick up a bill that Fernando has dropped, who prevents them from being arrested and offers them a job at a cake stand. Fernando meets Queta, El Pichi's sister, and they both feel attracted. This will lead Fernando to know the hardness of life for people in the suburbs.
A young man fails as a seller of household goods and his sister, tired of poverty, elopes with a criminal.
