Luna
While touring in Italy, a recently-widowed American opera singer has an incestuous relationship with her 15-year-old son to help him overcome his heroin addiction.
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Luna (1979) is a drama movie running 2h 22m. Starring Jill Clayburgh, Matthew Barry, Veronica Laz?r. Rated 6.3/10 on TMDB. Watch it online free on ZapFlix.