Mary (Taraji P. Henson) is a hit woman working for an organized crime family in Boston, whose life is completely turned around when she meets a young boy whose path she crosses when a professional hit goes bad.
In Boston, Mary (Henson), an expert assassin, kills her target Marcus Miller, a bookie, in his apartment. She discovers that Marcus had a son, a young boy named Danny (Jahi Di'Allo Winston), when she finds him in his room playing video games. Filled with guilt, Mary takes her leave. A year later, Danny is living on his own and has been working for a criminal named Uncle (Berkeley) and Mary has kept a distant eye on him. When a drug delivery to Jerome (Burke) goes bad, Danny asks for more money, finds it in a fridge, and takes it to Uncle. However, Uncle notices some is missing and smacks Danny when the boy says he used it to get food, with Uncle threatening to hurt the boy. When Danny is taking a nap on a bench, he notices someone swipes his bag and gives chase. Pulling out his gun and getting the thief to drop it, Danny then faints and falls to the ground. Several moments later, Mary finds him..