Ruth Slater is being released from prison. Earlier than expected, because of her good behavior. She packs her meager belongings and heads out into the world. Decades ago, Ruth to protect her sister had killed a cop. An unforgivable offense. Thus the name, Unforgivable. On the same day, elsewhere in the city, Katherine distracted after visions of her bleak past, gets into an accident. Unbeknownst to Katherine, after her sister was arrested, she was adopted by Michael and Rachel. She also grew up with a younger sister Emily. Ever since Katherine would have "nightmares" which were just her foggy recollections of her life with Ruth. Now fresh out of prison, Ruth is trying to make a life for herself. But the sins of her past are making it impossible to do so. Wherever she goes, she is haunted by the term "cop killer". She is beaten up sometimes and even has to change her job multiple times. Helpless and without any friends or family to fall into Ruth is having a tough time. She often visits the home that she shared with Katherine before her arrest. The house is now inhabited by Liz and John. John one day invites her in when he sees her. Much to Liz's dismay. If life wasn't already hard for Ruth, she is also being hunted by the sons of the cop she killed. Honestly, a lot is happening in Unforgivable. The sisters' reunion is being objected by everyone. The letters Ruth had sent Katherine, somehow never made their way to her. Society is being cruel to a convict. Even though she has finished her sentence, Ruth is still being punished. The job, financial scenarios are scary and hopeless for someone who was jailed. And the dilemma that if Ruth can even provide for Katherine is a sad reality. The plot, with numerous subplots, is too much. Sandra Bullock, of course, delivers a flawless performance. And Viola Davis is perfect as always. But even with such brilliant actors, the script leaves little for them to work with. Even though it portrays the hard-hitting reality of those who are released from prison, Unforgivable is rather sadly, forgettable. By SB