Warning: Major spoilers for Anatomy of a Scandal ahead. 

“Mom? It’s Holly.” 

With those three words in the final seconds of Episode 4, two seemingly unrelated narrative threads of Anatomy of a Scandal violently merge: Steely prosecutor Kate Woodcroft (Michelle Dockery) is actually a grown-up Holly Berry, the Oxford student whom James Whitehouse (Rupert Friend) sexually assaulted decades ago. It’s a revealing moment, in particular, for Sophie Whitehouse (Sienna Miller) — Holly’s first-year tutorial partner and James’ wife — who has yet to put these two pieces together but will eventually have to confront the difficult question she’s avoided for years: “Who is this man that I married, and what have I become?” 

If you’re still in shock, you’re not alone.“I did not see that coming,” Miller tells Tudum about initially reading through that scene, saying that she “immediately” read the next script. “I realized at that moment that I had to be a part of this show, because imagine if you were watching that! I love twists like that.” 

Many fans were confounded by the twist, but perhaps that was intentional. According to showrunner Melissa James Gibson, it was a “bold and shocking” choice, but one that added a lot of meaning to the show’s narrative. “It retrospectively add[s] many layers onto Kate, who has lived in her society on two very different levels,” Gibson tells Tudum. “She [has] completely reinvented herself in a way that she felt she needed to do to survive in this sort of upper crusty world.”

The past and the present are constantly colliding in Anatomy of a Scandal. Director S.J. Clarkson uses flashbacks to question the reliability of subjective memories, retelling the same events over and over again from different characters’ perspectives in an effort to tease out the truth. That starts at the very beginning of the six-part series, with the revelation that rocks Sophie’s perfect life: Her husband, Tory politician James Whitehouse, has been having a months-long affair with his parliamentary researcher, Olivia Lytton (Naomi Scott). 

Olivia Lytton (Naomi Scott) during a flashback in Anatomy of a Scandal.

The admission immediately sends Sophie into a memory spiral: What was she doing while James was with his mistress? Could she have suspected? Should she have? How many more have there been? Has her entire marriage been a lie? 

Sophie’s doubts about her husband only intensify when Olivia accuses James of raping her in a House of Commons elevator after their affair has ended. Sitting in the stands during the trial, she catches her first glimpse of Kate Woodcroft, the woman assigned to prosecute the case. Something about her always seems eerily familiar to Sophie, but she’s not sure what it is.

Confident, capable and seemingly unflappable, Kate is a far cry from the shy, awkward Holly we’ve glimpsed in flashbacks. And, indeed,Sophie doesn’t suspect the connection until a political fixer tells James that an Oxford administrator has come forward with a story of a young woman accusing James of assaulting her back when he attended the school. Her name? Holly Berry. James denies ever having met Holly, but Sophie remembers the quiet girl from Northern England for whom attending Oxford was the ultimate dream come true. But near the end of term, Holly disappeared, never to be heard from again. 

Sophie (Sienna Miller) and James Whitehouse (Rupert Friend) on their way to court in Anatomy of a Scandal.

The news pulls Sophie deeper and deeper into her memories of that time. Could the man she married really be capable of sexual assault? She already knows that he’s committed a crime: An Episode 3 flashback shows that James helped his best friend Tom Southern — now the UK prime minister — cover up the fact that he had given heroin to a friend who died as a result of the drugs. James disposed of the evidence, throwing the drugs away as the two ran from the scene of the crime. 

But a flashback from that same night, told from Holly’s perspective, reveals that there’s even more to the story. James, high on the adrenaline of having helped Tom, bumps into Holly in an abandoned cloister. In a callback to Olivia’s trial testimony, what starts out as a consensual encounter suddenly turns into an assault. Holly says no, and James whispers, “Don’t be such a prick tease,” the same words Olivia accused James of saying to her in the elevator. 

In the aftermath of her assault, a traumatized Holly leaves Oxford for the University of Liverpool, changes her appearance, her major, her accent and, eventually, her name. (“My middle name plus my ex-husband’s surname,” she explains in the finale.) Hence, Kate Woodcroft was born.

Kate Woodcroft (Michelle Dockery) finds her past starts to creep up on her in Anatomy of a Scandal.

So complete is her transformation that Kate doesn’t immediately process the trauma of choosing to prosecute her own rapist until the finale. When James is acquitted, she returns to her apartment and lets out a primal scream of grief that contains years of repressed memories and feelings. The scream is painful but also liberating for Kate, who is finally able to confront both sides of herself. “That was what was bubbling beneath the surface: the visceral, organic raw, kind of monstrous scream,” Clarkson tells Tudum. “That's what [Kate is] keeping a lid on.”

But if Kate’s arc leads her to reconcile her past with her present, Sophie’s transformation in the show’s finale takes the opposite course: She’s severing ties with her past and embracing a whole new future. “Throughout the whole series, those women are both on a trajectory of discovery about themselves,” Clarkson says.

With James’ acquittal, everything seems like it might return to normal. Far from acknowledging any wrongdoing, he’s ready to put this all behind him and even poised to regain his parliamentary duties. This is the last straw for Sophie, who realizes that continuing on this path makes her complicit.

She leaves her husband, and, in a meeting with Kate, the two finally lay their cards on the table. “You know what finally gave you away? Your left-handed scribbling and your color-coded notes,” Sophie says, before dropping a bombshell of her own. She has leaked James’ involvement in his friend’s death at Oxford to the press, implicating him and the prime minister in a monumental scandal that could put them both in jail.

Kate Woodcroft and Sophie Whitehouse meet in the finale of Anatomy of a Scandal.

The closing moments of the finale show an unburdened Sophie playing in the countryside with her children, while Kate returns to the life she’s painstakingly built for herself — with one major change. “Who are you? Holly or Kate?” Sophie asks her when they meet. Kate takes a beat, before she answers: “I guess I’m finally both.”