Amalgamated Dairies hires David Rutherford, an FBI man turned industrial saboteur, to investigate a popular new product called “the Stuff,” a new dessert product that is blowing ice cream sales out of the water. Nobody knows how it’s made or what’s in it, but people are lining up to buy it. It's got a delicious flavor to die for!

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.

The amusing adventures of an unsophisticated small-town lad who arrives in New York, moves in with his swinging buddy, and surprisingly becomes an authority on the ways and wiles of women as he enters the world of big-time girl-chasing.