Jimmy Valentine is a professional thief, an expert safe-breaker no less. He's just been released from prison for this very crime, although he claims to the warden that he was innocent all along. Yet as soon as he is released from prison, he's up to his old tricks again. Ben Price, the detective hot on Jimmy's trail, recognizes his method of work; there's only one man who could be responsible for this spate of thefts in the Midwest.
But Jimmy has an unexpected change of heart. Upon arriving in a small town in Arkansas, he meets a young lady whose father owns the local bank. Jimmy wants to settle down, open a shoe repair store, and get married to the young lady. He writes a letter to Ben telling him that he's had enough of his former life and wants to give it up.
However, Jimmy's safecracking days are not quite over, as an unusual event causes him to take up his special tools for one last time.