Compelling drama, highlighting women's very narrowly restricted freedom to live a life in Iran. She became a widow after her husband was executed for a murder. The opening scene shows us that the judicial system failed here, in hindsight, as the real murderer was found later, one year after the execution. Quote: "It would have been the will of Allah, otherwise this would not have happened," a peculiar line of reasoning that only believers in Divine Providence can follow. She demands a bureaucratic excuse and is promised some financial compensation but that is left dangling for no clear reason.
Being dramatic enough in itself, it is only a prelude to the story that follows. After letting an unrelated man in her house, someone who wants to repay a debt owed to her late husband, precisely at a moment that she nearly runs out of money, so he was very welcome. Alas, others in the apartment block saw it happening without a "responsible relative" present, and this proves to be ample reason for unconditional eviction out of her apartment. Similar offenses against how a woman should behave, all of those trivial in our eyes, gave rise to accusations of being a bad mother, and she has to defend the custody of her daughter in court.
The death penalty after a murder is not the central issue here, although it seems that way for a moment. As explained in the movie, imprisonment seems easier to reverse when proven unjustified after some years. But that is only superficially so (quote: can you repair 10 years of someone's life in prison??). There had been due process, after which three judges were convinced of the guilt of the defendant. This movie has no intention to criticize Iran's judicial system (contrary to convictions in the context of religion or politics, as demonstrated in other movies, but that is a completely different matter and not the topic here). In the murder case at hand there were two independent witnesses, which is deemed sufficient as per current law (quote: how many more witnesses do we need to be really sure?). And that one of the witnesses proved an opportunistic liar in hindsight, being the actual murderer himself, can happen everywhere.
I don't think it is proficient to reveal subsequent developments. It is made very clear that every move this woman makes, works out contra productively. After losing her house (see above), also her job in the factory she works is at stake, as well as the custody of her daughter. Then there appears a man she does not know on her doorstep, at the rescue. I leave the remainder of the story for you to watch how it logically develops while seeing this movie that is worth its time in full.