Salón México is a 1949 Mexican film noir directed by Emilio Fernández and written jointly by Fernandez and Mauricio Magdaleno.
[1] It stars Marga López as a dance hall prostitute struggling to support her younger sister at an exclusive upscale school.
Mercedes works at the "Salón México" dance hall as a singer, dancer and prostitute.
Beatriz does not suspect what Mercedes is doing and dreams of marrying Roberto, a young Air Force pilot, who is the son of her school's principal.
A dance contest with a large money prize of 500 pesos is announced and Mercedes enters it with Paco, her pimp.