Grant stars as Leopold Dilg, a political activist who is wrongly indicted for arson and murder when a factory worker dies in a mill fire in the town of Sweetbrook. Believing that he'll be executed if he remains in jail, he escapes and breaks into a cottage that schoolteacher Nora Shelley (Jean Arthur) is preparing for Professor Michael Lightcap (Ronald Coleman), the dean of a law school. She allows Grant to stay in the attic, without alerting the professor. The next day, a reporter arrives to question Lightcap about Dilg's case, along with Sam Yates (Edgar Buchanan), Dilg's lawyer, who comes at Nora's behest. Since Yates and Lightcap know each other from law school, Yates asks Lightcap's help in defending his client, who he claims to have been framed. The professor refuses, intent on writing a legal treatise. Before Yates leaves, he persuades Nora to house Dilg, who she introduces to Lightcap as a gardener. Before long, the professor begins to realize that the gardener is well versed in the intricacies and inequities of the U.S. legal system.