Author Kate Feiffer’s first adult novel “Morning Pages” is a play within a play: the main character is a playwright and much of her internal dialogue is on the page as scenes from a play. Moreover, she’s turned to a popular daily artist’s exercise to jumpstart her imagination. It’s fair to say that “Morning Pages” is pretty meta. All that as the fictional Elise Hellman is caught in a life’s passage tending to the needs of an aging mother and a teenage son. “Morning Pages” is our September selection for  “Bookmarked: The Under the Radar Book Club.”