Heloise and Abelard, Beatrice and Benedick, Catherine and Heathcliff: move over, famous lovers of history and literature, and make way for Megan Mullally and Nick Offerman.  The stars of hit TV shows like Will & Grace and Parks and Recreation are maybe the most passionate  — and almost certainly the funniest — real-life couple in Hollywood.  The secrets of their partnership are unfolded with the sort of deadpan hilarity their fans have come to expect from their performances in their new book The Greatest Love Story Ever Told.  But here’s something you may not know:  Mullally and Offerman are both passionate readers as well, and so we asked them to record a special episode of the B&N Podcast in which they interview one another about their mutual love affair with books.  The result is a meeting of a very unique book club, with only two members — and we get to listen in.