Set in 1959, Diner shows how five young men resist their adulthood and seek refuge in their beloved Diner. The mundane, childish, and titillating details of their lives are shared. But the golden moments pass, and the men shoulder their responsibilities, leaving the Diner behind.

Respected liberal Senator Joe Tynan is asked to to lead the opposition to a Supreme Court appointment. It means losing an old friend and fudging principles to make the necessary deals, as well as further straining his already part-time family life. But it could be a big boost to his career, so he takes it on. Helping him prepare the case is pretty southern researcher Karen Traynor, and their developing relationship further complicates and compromises his life.