Lucy Moro and her older sister Martha are anti-death penalty protestors, fighting for the acquittal of their father Simon, who is on death row for the murder of their mother eight years ago.

At one demonstration outside a prison in Illinois, Lucy meets Mercy Bromage, a lawyer whose father is a police officer with ties to the death penalty case the crowd is protesting.

Meanwhile, Martha is determined to free Simon (who she still believes is innocent) and manages to hire a lawyer, who is then able to get a four-month stay of execution to look for legal loopholes or any new evidence to re-open the case.

In August 2016, Elliot Page, Kate Mara, Pablo Schreiber, Elias Koteas and Amy Seimetz were cast in the film, with Tali Shalom Ezer directing from a screenplay by Joe Barton.

The website's critical consensus reads, "Though My Days of Mercy's knotty romance drifts into melodrama, it's grounded by Ellen Page and Kate Mara's exceptional chemistry.