"You in Midair: An Elegy for a Daughter" is not an elegy, and it's not about the daughter. A more accurate subtitle — “A Mother's Lament,” “Life with a Hole in It” ? — would better prepare us. What we experience is the long, often difficult journey of a mother whose bright child, a rising actor, was torn away by murder. Danna Schaeffer seasons the story with wit, and tells us movingly of her grief; but because she declines to enter it or share it fully, we are allowed no catharsis, no relief.