From NetFlix:

The lives of Ethan (Joaquin Phoenix) and his wife, Grace
(Jennifer Connelly), are thrown into chaos after their 10-year-old
son is killed in a hit-and -run accident. When the case stalls, Ethan
makes it his mission to hunt down and punish the person responsible.
Violence, revenge and justice collide head on when Ethan finally finds
the man who killed his son. Mark Ruffalo co-stars

I don’t remember seeing Joaquin Phoenix in a bad movie. Considering the good actors that are in this film, somehow the film seemed flat. It is NOT a feel-good movie. But it would probably teach a lot to a child. The story line is compelling and I can see just this sort of thing happening (although the relation between aggrieved father and guilty driver is a bit contrived). I begrudgingly give this film an A.