Anastasia ‘Ana’ Steele and Christian Grey return to Seattle after a long honeymoon. Christian is upset to find that Ana has kept her maiden name, Steele, at work. After some resistance, Ana adopts the name Steele-Grey after realizing how important it is to Christian. As a belated-wedding gift, Christian gives Seattle Independent Publishing to Ana, who plans to rename it Grey Publishing.
While Christian is on a business trip in New York, Anastasia goes out for a drink with longtime friend, Kate Kavanagh, doing so against Christian’s wishes. Returning home, she finds that her former boss, Jack Hyde, who was fired for attempting to sexually assault Ana, has been apprehended by the security staff. When duct tape found in his pocket indicates he intended to kidnap her, he is arrested. Christian is angry that Ana went out with Kate, and Ana berates him for being overly controlling and possessive. She demands more freedom. Soon after, Christian surprises her with a trip to Aspen, with Kate, Elliot, Mia, and Kate’s brother, Ethan. While there, Elliot proposes to Kate, and she accepts.
Ana’s step-father, Ray, is in a medically-induced coma after a car accident. When he awakens a few days later, Ana and Christian arrange to move him to Seattle to recover. It is also Ana’s birthday weekend, and Christian surprises her with all her family and friends at a dinner. He gives her a charm bracelet with the charms representing all their “firsts” including an ice cream cone to represent their “vanilla” relationship. Christian also gifts her with an Audi R8. Soon after, Ana learns she is pregnant. Christian angrily accuses her of getting pregnant on purpose and leaves. He returns early the next morning drunk, claiming Ana will choose a baby boy over him. Ana says it could be a girl, though Christian refuses to accept that due to his sexist and chauvinistic nature. Ana become furious when she discovers a text message on Christian’s phone from Elena Lincoln, the woman who seduced him when he was fifteen and introduced him to the BDSM lifestyle. The message indicates they met for a drink.
The next two mornings, Anastasia and Christian barely speak to each other: Christian is angry over the unplanned pregnancy; Anastasia is upset about his late-night encounter with Elena, though Christian insists their relationship is long-since over. When Christian is away on a business for a few days, Ana receives a call from Jack
Hyde. He has kidnapped Mia Grey and demands $5 million in two hours. He warns Ana not to tell anyone or he will kill Mia.
Anastasia feigns illness and returns home to escape her bodyguard, Sawyer. She takes a gun and goes to the bank. While collecting the money, the suspicious bank manager calls Christian. who believes Ana is leaving him. To protect Mia’s life, Ana lies to Christian, saying she is leaving him to raise the baby alone. Hyde instructs Ana to leave her phone but she tricks him by taking the bank manager’s phone instead and dropping it in the trash. She leaves via the back entrance to a waiting car, shocked that Hyde’s accomplice is Elizabeth Morgan, her co-worker. When handing over the money, Hyde tries to kill Ana out of vengeance for losing his job, causing Elizabeth to feel guilty for being involved. Angered by his behavior and his hurting Ana, she and Hyde argue. On the ground and bruised, Ana shoots Hyde in the leg. When Ana starts to black out she hears Christian calling her name.
Ana wakes three days later in the hospital with Christian at her side. Though he is angry at Ana’s recklessness, and still anxious about fatherhood, he realizes how important their baby is to her, and they reconcile. Ana returns home the next day. Christian learns from his private investigator, Welch, that he and Hyde had the same foster family. He tells Ana about how he met and was seduced by Elena. By introducing him to the world of BDSM, Elena helped Christian learn to take control of his life. If she had not intervened, he would still be plagued with horrible memories of his mother and would never have been able to control his life. Ana feels guilty for her behavior when he explains that he had been looking for his psychiatrist, Dr. Flynn, because he needed help. When he could not contact Flynn, Christian wound up at Elena’s salon and they then had a drink at the bar. Although she made a pass at him, Elena realized that Christian loved Ana.
The next day, a furious Christian discovers that Elena’s ex-husband, Eric Lincoln, has bailed Jack from jail out of spite for her affair with Christian. Christian tells Ana that after learning about the affair, Eric severely beat Elena and divorced her. Despite Christian’s urging, Elena refused to press charges against Eric out of guilt. Christian retaliated by buying out Eric Lincoln’s logging company to sell it off. It is also learned Elizabeth confessed to police that she was blackmailed by Hyde to be his accomplice. (However, her ultimate fate remains a mystery.)
Two years later, Ana and Christian have a son named Theodore Raymond Grey, nicknamed Teddy, and Ana is six months pregnant with their second child, a daughter whom they decide to name Phoebe. Elliot and Kate have married and have a two-month-old daughter named Ava. At the end, after having BDSM sex, Ana and Christian are getting ready to celebrate Teddy’s second birthday with their family and friends.