Mass imagines the meeting of two sets of parents of children killed in a tragedy. Ann Dowd and Reed Birney meet Martha Plimpton and Jason Issacs in a dingy church basement for an encounter arranged by clergy. The story unfolds theatrically, more like a play than a film. As the layers peel away, intensity increases. Mass contains first rate acting, especially from grieving mothers Ann Dowd and Martha Plimpton. It takes courage to watch this tough difficult encounter.