Yes, of course nobody was privy to the weekly conversations between Margaret Thatcher and Queen Elizabeth, but Moira Buffini can imagine, based on the public demeanors, words, and actions of the two women what those talks might have been like. Depth and perspective is enhanced by Ms. Buffini's clever and convincing device to have two Queens, two Iron Ladies. Each is represented by a younger and older version of herself, which allows for a revealing and often comic four-way dialogue. Two male actors ably portray a slew of other figures, but it's the women who command the stage.