Call Northside 777

It's 1932 Chicago during prohibition. A policeman is murdered by 2 men in a speakeasy. Frank Wiecek (Richard Conte) is sentenced to 99 years. Eleven years later, Frank's mother offers $5k reward in a newspaper ad for the real killers. Cynical reporter P.J. O'Neal (James Stewart) is assigned the story. He is pushed to dig into the case by his editor Kelly (Lee J. Cobb). He starts to change his mind about the case and gets pressure from the establishment.

The based-on-a-true-story worked on me a little in this movie. With the matter of fact narration and the trusted face of Stewart, it becomes quite compelling. Stewart especially is the perfect guy for the role. His early cynicism is a great starting point. This is a compelling rip-from-the-headlines story led by a great actor.