Just twice in four decades of theatre have I bought the show's script duringintermission, and Tom Stoppard's Arcadia in 1995 was one of them (Shadowlands byWilliam Nicholson was the other). The most emotional play in Stoppard's cannon, itoffers a mystery told through two intertwining stories that touch on many topicsbefore its solution, including academic jockeying, the making of history, landscapegardening, Byron, N…