From NetFlix:

Convinced that her brother, Kenneth (Sam Rockwell), has been unjustly convicted of murder and incompetently defended by court-ordered attorneys, high school dropout Betty Anne Waters (Hilary Swank) puts herself through law school in order to represent him in his appeal. Inspired by a true story, director Tony Goldwyn’s stirring drama also stars Melissa Leo, Minnie Driver, Peter Gallagher and Clea DuVall.

Miscarriages of justice, at least for me, are always compelling stories. Of course, you know that the film would not have been made if events had not turned out well for Kenneth Waters.

Read about about the history in the Wikipedia article. There you will also find mention of Martha Coakley, Attorney General of Massachusetts. In the film she comes off very badly. Hearing her name so often during the film was almost a shock. Read about her reaction to the film in the same Wikipedia article. Politicians always know the right thing to say.

Warning: Although the film is eventually a feel-good, getting to the end is a real roller-coaster of setbacks. At the very least, I can only admire the incredible and inspiring fortitude of Betty Anne Waters.

Do NOT miss the final frames which explain in text how things turned out after Kenneth got out of prison. Also the Wikipedia article has some follow through.

My biggest disappointment was that the corrupt woman Ayer police officer, Nancy Taylor, who framed Kenneth could not be prosecuted due to the Massachusetts statute of limitations.