Plot
Newlyweds Christian and Anastasia are forced to cut their honeymoon short and return home after receiving news of a break-in at Christian's corporate headquarters. Jack Hyde, Ana's former boss who was fired for sexual assault, stole some computer files.
Christian surprises Ana with a new house and has hired architect Gia Matteo to rebuild it for her. Ana is annoyed when she openly flirts with Grey. She later threatens to fire Gia if she keeps it up, forcing her to stop.
When Christian is away on a business trip, Ana disregards his wishes that she stay at home, and meets her friend, Kate Kavanagh, for a drink. Kate is dating Christian's older brother Elliot and fears he may be having an affair with Gia, his business associate. Jack Hyde attempts to kidnap Ana when she gets home. Her new security team subdues him, and he is arrested.
After arguing with Christian about her night out with Kate, Ana berates him for being controlling and possessive, demanding more freedom. He later surprises her with a trip to Aspen, bringing along Kate, Elliot, Mia, and José. Elliot proposes to Kate, who accepts. It is revealed that Gia was only helping him choose the ring.
The newlyweds continue with their sexual experimentation, but it becomes complicated when Ana announces she is pregnant. Christian is disturbed, as he had other plans for their early years together. He leaves, going on a night-long drunken bender. After he returns, Ana discovers that Christian had texted and met his ex-lover, and former BDSM dominant, Elena Lincoln, who had groomed him as a minor. Angry, she locks herself in the playroom for the night. He searches for Ana in the morning and they continue arguing, with she telling Christian how important the baby is to her.
Shortly after, Hyde is released on a $500,000 bond and phones Ana, demanding a ransom of $5 million in cash in two hours for Mia, Christian's abducted sister, if his demands are not met. Ana must not tell anyone and bring the money alone. She takes a checkbook and revolver from Christian's desk and goes to the bank to withdraw the money.
The suspicious bank manager calls Christian. He thinks Ana is leaving him, but then discovers that Mia being missing and Ana's sudden large cash withdrawal coincide with Hyde's recent release. Hyde instructs Ana to get into a car parked nearby and hand over her phone to the driver. She tricks Hyde by taking the bank manager's phone and slipping hers into the bag of money. She exits the back entrance to discover that the driver and Jack's accomplice is her co-worker, Liz.
At the drop-off site, a psychotic and vengeful Hyde attacks her, kicking her abdomen. Liz tries to stop him as Ana pulls out the revolver and shoots him in the leg. Christian and his security team, who tracked Ana's phone, arrive with the police who apprehend Hyde and Liz. Ana blacks out as she hears Christian's voice.
She wakes up three days later in the hospital with Christian at her side. Though angry at her recklessness and still anxious about fatherhood, he realizes how important their baby is to her, and they reconcile. Christian's adoptive mother Grace assures him that Ana will not leave him. She returns home the next day.
Christian's private investigator, Welch, has left a report showing that Christian and Hyde had shared the same foster family, though Christian seems to have no memory of this. Hyde was envious of Christian being adopted by the wealthy Grey family instead of him. He had also blackmailed Liz with a sex tape into being his accomplice.
Christian and Ana find out where his birth mother is buried. They visit her grave, and he lays flowers on it. Ana reflects on her whole journey with Christian and how they fell in love. She then goes to the red room and invites him to join her, where Christian delivers the dialogue "You're topping from the bottom, Mrs. Grey. But I can live with that."
The final scene is years later with Ana and Christian at their house by the lake with their son, Teddy. Ana is already pregnant with their second child.