Mass: A new film centered around grief, forgiveness and reconciliation

Fran Kranz, the writer and director of "Mass," joins CBS News' Vladimir Duthiers to discuss his poignant new film. Centered around the emotional aftermath of a school shooting, Kranz discusses why he choose the subject matter for his debut film and working with actors Ann Dowd, Reed Birney, Jason Isaacs and Martha Plimpton.

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