To the credit of the author—and to director Arin Arbus and the entire cast—each of these characters come across as warmly human, flaws and all. Is Ella the primary character of the play? Or is it just that the always-astonishing Maryann Plunkett is playing the role, and when Maryann Plunkett speaks—or even sits alone in the light, clearly thinking but unable to express the words—you can’t help but be riveted.