A plot about the walking wounded is an indie staple, and Manchester by the Sea wears no external garb beyond the stereotype. Lee Chandler (Casey Affleck) isn’t an Iraq War vet or a widower whose dead wife has left him bereft. At first we don’t know why he’s wounded—the opening scenes are of a taciturn, truculent janitor in a small apartment building in Quincy, outside Boston. Lee is thirty-something, scruffy, eyes averted, and armed with a huge chip on his shoulder that causes him to lash out at a bitchy tenant with a defiant lack of remorse. In his psyche the tarp is nailed down at all four corners unless a gust of wind flaps one up.