Linda McLean's Any Given Day, now having its American premiere at the Magic Theatre, is theater for grown-ups. There's nothing fanciful or sensational about. It's basically duet conversations in two acts and less than 90 minutes. But the richness of McLean's language, seemingly so simple yet so precise in defining the characters and their relationships to each other and to the world.

The pain and sadness is palpable in these people, yet so are the passing moments of joy and kindness and good humor. McLean's world is full of the kind of emotional upheaval you only get to see when you spend time with people and see what's really happening with them under their reasonably calm, reasonably functional exterior selves. To catch glimpses of the real turmoil underneath is an astonishing achievement, and that's what McLean and this powerful production manage to accomplish.