When a child is born to drug-addicted teens, a social worker is confronted with an unforgiving dilemma. Family secrets, moral ambiguities, faith, biases, and the beleaguered welfare system collide in this riveting and arresting contemporary drama. A play that The New York Times called “smart and absorbing,” “Luna Gale” is sure to provoke questions of how we care for the most vulnerable and at-risk.