What Maisie Knew is an adaptation of the Henry James 1897 novel, updated to Manhattan in the now, and is described in the bumf I received as ‘heart-warming’, which is utterly strange, as it’s a child-caught-in-the-middle drama, and just so painful. It’s compelling. It’s exquisitely done. It’s brilliantly acted. (According to the most recent figures,  the chances of Julianne Moore turning in a duff performance are 0.00