On July 22, 1934, FBI agents shot and killed John Dillinger outside the Biograph movie theater in Chicago. This movie says they shot his brother, while Dillinger, in the person of Martin Sheehan, moved hundreds of miles away, married, and became a farmer. Five and a half years later, Al Capone was released from prison because of dementia due to syphilis. He moved to his Florida house, kidnapped Dillinger's wife and stepson and forced Dillinger to go to Chicago and steal the $15,000,000 in cash he had stashed in a vault.
All complete nonsense, of course. Sheen's Dillinger is a decent family man who regrets his lawless past, in a philosophical, shrugging way, while F. Murray Abraham's Capone is a delusional monster with a butler, Stephen Davies, who gets seconded to Sheen for the big bank robbery. There are also a,lot,of,shots,in sepia monochrome that lead into set shots, and a soundtrack that is based on the Carnegie Hall version of "Swing, Swing, Swing." Catherine Hicks, as Sheen's wife, delivers her lines in a manner that emphasizes how badly they are written.
Short of the real-life people which this movie hangs its hat on, this might have made a decent movie. With them, it becomes nonsense.