‘Mass’ bravely dives into deep, emotional places in one confined space

“Mass” – Here’s my best advice to approach “Mass”, writer/director Fran Kranz’s first film.  Don’t watch the trailer. This gripping, conversational drama is almost entirely set in one location.  The four main characters confront a painful, deeply personal topic, one that has haunted them for years, but don’t ask a friend, sibling, your local movie critic, or the Internet the key matter that Jay (Jason Isaacs), Gail (Martha Plimpton), Linda (Ann Dowd), and Richard (Reed Birney) debate.  During an Oct. 10 interview with Collider, Kranz says, “Look, it has been…