When it comes to vengeance, age is just a number.
Gloria Jones has had enough. She's sixty-five, approaching retirement, and nearing the end of her tether. If she gets abused in the street by another toerag, someone's going to swing.
When Gloria collects a gun she saw being thrown into her local park, her decision to turn it in is quickly scuppered after she's attacked on her way to the police station. Using the gun to make her attackers back off, she accidentally pulls the trigger and ends up killing them both. In that moment, her life changes forever.
As she struggles to come to terms with what she's done, Gloria begins to realise there is injustice all around and finds herself transforming from a shy, peaceful woman into a confident and ruthless vigilante, determined to help victims of crime unable to defend themselves.
And so begins a three-month campaign, taking revenge against violent criminals up and down the country, helping those who can't help themselves. After all, who's going to question a little old lady just going about her business?
Turns out, quite a few people, on both sides of the law, and one in particular seems to know exactly what she's been up to.