What is unusual about Maxwell’s production is the complexity of Davies’ characterization, especially her enthusiastic sexual embrace of De Flores, even as her lust lives in such close proximity to her ongoing detestation of this sycophant with a price. The play thus becomes a meditation on a woman trapped by patriarchal modes of possession and whose only chance for sexual self-expression is with a man she hates. Davies is doing the best acting work on view at Stratford this year; Maxwell’s “The Changeling” teems with uncertainty, insecurity, pain and pleasure.