Mia Nolan

Mia Nolan is the protagonist villain in the episode "Crocodile", the third episode of the fourth season of Netflix original British science fiction anthology series, ''Black Mirror. ''A recognized wealthy architect that in her youth with her boyfriend back then, Rob, hid the dead body of a cyclist Rob ran over under the influence of alcohol and drugs, the memory of this event will return 15 years later to torture her, leading to a series of tragic events.

She was portrayed by Andrea Riseborough.

Personality
Mia is a very serious and professional business woman, although in her youth she was more rebel, when her boyfriend back then, Rob accidentally runs over a cyclist, Mia is seen to be more concerned and disturbed by the situation and even wants to call the police until Rob convinves her to throw the body from a cliff into a river.

15 years later, now a recognized architect she looks like having everything under control in her business, she sometimes drinks wine in her free time, she loves her son and new husband, but when Rob appears again wanting to confess what he did, even though he tries to convince Mia that he won't say her name, Mia insecure and scared strangles Rob to death, this is when Mia's personality changes radically, more nervous and cold-blooded murderer, however after each murder she appears to be absolutely sorry and disgusted for what she does.

15 Years Ago
After a night out, Mia and her boyfriend Rob were returning from a party driving down a lonely highway by the mountains, under the influence of drugs and alcohol, Rob runs over a cyclist, killing him, Mia disturbed by this wants to call the police, but Rob stops her, as if Rob was driving then he would be in trouble, so he convinces Mia to put the body in a sleeping bag along with rocks and dump it to the river.

15 Years Later
Mia is now a recognized and wealthy architect with a husband and a son, during a business trip staying in a hotel she is visited by Rob who reveals to her that he left alcohol and now is looking forward to heal all the damage he did during his addiction, he plans on sending an anonymous letter to the widow of the mysterious cyclist after reading an article about his "disappearence" 15 years ago, Mia argues with him as she would be implicated as well if anyone finds out were the letter came from, Rob tries to calm her down and tries to leave but Mia scared, strangles Rob to the death, she then pays for a pornographic movie and asks for room service to hide the body on the cart, while doing this, she looks out the window and witnesses an accident on the street when an automatic pizza delivery truck hits a young men. Mia leaves the hotel with Rob's dead body hidden on the cart, then puts it on her car and drives towards a construction zone of her company and dumps the body in the sewer.

The Recaller
The next day, insurance Agent Shazia Akhand is interviewing the young man who was hit by the truck, She uses a device known as a Recaller (a device also used by the police) to scan a claimant's and witnesses' memories to verify the claims, despite memory being acknowledged as unreliable. Following a chain of witnesses (a young woman and a dentist) trying to find out the speed the truck was going at, she is eventually lead towards Mia by the dentist's memories, she visits her in home while her family is out, Mia nervously lets her in, Shazia thinks she is nervous about the porno movie she paid for, Mia meanwhile tries to make time while she tries to consentrate and convince herself to show fake memories, when she is connected to the Recaller, Mia memory betrays her and Shazia sees the accident but also Mia killing Rob, Shazia leaves the house telling Mia she has everything she needs, but Mia knows what she saw, and tries to convince her it wasn't real while chasing her towards her car, Shazia pretends she didn't saw anything but Mia kidnaps her in her shed, she uses the Recaller on Shazia trying to find out if anyone else knows about her visit, while crying for what she did, she sees in the Recaller Shazia told her husband Anan, as Shazia begs for mercy, Mia beats her to death with a piece of wood, then she runs outside and pukes.

Crocodile
That night Mia had to assist to an event at her son's school, but before that, Mia uses Shazia's car GPS to drive to her home, armed with a hammer, he sneaks into her house and upstairs, were Anan is taking a bath, while approaching him without him noticing, Mia's husband calls her making her phone buzz, alerting Anan, Mia then proceeds to kill Anan with the hammer beating him twice in the head, again crying and sorry for what she did, she intends to leave the house, but she discovers they had a baby, crying she approaches to the baby's cradle and kills it, leaving no witnesses to be scanned with the Recaller, then she attends to her son's school, disturbed and nervous without knowing that the police is already at Shazia's house investigating the murders, it is revealed that the baby was born blind, it is also reavealed that the baby's pet Guinea Pig was in the room and the police can use the Recaller on it, at her son's school, Mia tries to act normal but then she sees the police entering the school, as she continues to pretend, feeling more and more nervous as the episode ends.