The story of Damon and Pythias has exemplified friendship and loyalty since the time of the ancient Greeks. The story of Colin Warner and Carl King should stand beside it. King spent 21 years working to get Warner released from prison after he was unjustly sentenced for murder. A reporter for “This American Life” told their story, and now it has been adapted for the screen by former NFL player Nnamdi Asomugha, who plays King opposite the extraordinarily gifted LaKeith Stanfield (“Get Out,” “Short Term 12″) as Warner.

The friends met growing up in Trinidad and then reconnected when both emigrated to the Crown Heights neighborhood of Brooklyn. Writer/director Matt Ruskin and Director of Photography Ben Kutchins evoke the lively but volatile and gritty atmosphere of 1980 Brooklyn. Warner is not even in the wrong place at the wrong time. He is nowhere near the spot where an apparent revenge execution-style murder is committed. But the cops are overwhelmed and under a lot of pressure to produce arrests and close cases. Archival footage of Presidents Reagan, Clinton, and George W. Bush promising crackdowns on crime provide context.

It is possible that determination to be fair to as many people as possible costs the film some dramatic momentum, especially as it stretches over decades, with setback after setback and complication after complication, plus the various family stresses, particularly with King as his wife understandably gets frustrated with the time and money he is devoting to Warner instead of their children. But the dignity and sensitivity of the performances by Stanfield and Asomugha hold the story together. But the time King takes a job as a process server in order to better understand what kind of legal help they need, things begin to pick up. A tender romance and a touching expression of forgiveness give the film a quiet power that I hope will not always feel as timely as it does right now.

Parents should knot that this story concerns a wrongful murder conviction and includes peril, violence, abuse, strong language, some sexual references and situations, and some nudity.

Family discussion: Why does this film title refer to the neighborhood, not the people involved? Why didn’t Carl give up? Listen to the story that inspired this film on “This American Life.”

If you like this, try: “Conviction” and “Hurricane”