With help from Elaine, his girlfriend, young John Dillinger breaks into her father's safe. They are caught, but Dillinger takes the rap by himself.
In prison, he meets Pretty Boy Floyd and Baby Face Nelson, who join Dillinger's gang after he masterminds a prison break. Elaine goes along, but when she becomes pregnant and is rejected by Dillinger, she rats him out to the FBI.
Shot cheaply in 17 days without period costumes, Robert Conrad recalled that he only did the film to repay a favor to his friend Nick Adams.