The film tracks the last few months of John Dillinger's life. We see him as an iconic figure at first, how he was nearly caught a number of times, how local crime bosses helped get him caught, and his eventual death at a movie theatre.
Like I said, the film wasn't bad. It looked like it caught the period correctly, but it was too long. At 139 minutes, there were times when scenes dragged, and those scene made me think that the film could have done with some judicious pruning.