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Esperanza Iris had already been in Mexican films for several years by the time she made Noches de Gloria (Glorious Nights), but she tackles the assignment with the freshness and enthusiasm of a movie newcomer. Framed for the murder of her husband, opera star Marta Rey (Iris) is carted off to prison for 15 years. Upon her release and exoneration, Marta is reunited with her daughter Mercedes (Magda Haller). For Mercedes' sake, Marta decides not to revitalize her career by capitalizing on the publicity attending her prison sentence. The film's highlight is Iris' rendition of one of her standard tunes, A Poco No.