Jimmy Dworski(James Belushi) is a criminal serving the last 48 hours of a jail sentence. He wins a couple of baseball tickets by calling a radio quiz show. With help of other inmates, he escapes to go watch the game. When by chance he finds the Filofax of executive Spencer Barns(Charles Grodin) who loses it while traveling on a business weekend. Jimmy finds cash, credit cards and the key to a big mansion. He jumps on the opportunity and starts posing as Barns. While the real Barnes is trying to find his Filofax he gets in all sorts of trouble. How will things turn out when the two finally meet?