Tommy erupts in rage after being chosen last in a football game and Kathy steps forward to calm him down.

Tommy secretly meets Kathy beside the school pond to share what Miss Lucy told him about the children's uncertain futures.

The students swarm around Madame during one of her visits and confirm that she is genuinely afraid of them.

Miss Lucy tells students sheltering from rain that they are clones who will donate their organs until they die.

Ruth and Tommy become a couple during their final years at Hailsham.

Kathy dances alone in her dorm while cradling a pillow to the song 'Never Let Me Go' as Madame watches and weeps.

After Kathy helps broker a reconciliation, Ruth and Tommy reunite as a couple and the three students graduate from Hailsham.

Kathy, Ruth, Tommy, Chrissie, and Rodney travel together to a small Norfolk seaside town to find Ruth's possible.

The group follows Ruth's possible to an art gallery and realizes the woman bears little resemblance to Ruth.

Ruth tells Kathy that Tommy has no romantic feelings for her and warns her not to pursue him.

Kathy leaves the Cottages and begins training as a carer, separating from Ruth and Tommy.

Ruth apologizes for years of manipulation and hands Tommy Madame's address during a day trip to a stranded boat.

Ruth dies after her second organ donation goes badly.

Miss Emily, confined to a wheelchair, tells Kathy and Tommy that deferrals have never existed and Hailsham was a failed human experiment.

Tommy completes after his fourth donation and Kathy drives alone to Norfolk to grieve at a field's edge.

Pool 1 traces the central arc of Kathy, Ruth, and Tommy from their years at Hailsham boarding school through to their deaths as organ donors. The early events establish Tommy's anger problems, Kathy's quiet bond with him, and the unsettling truths that guardian Miss Lucy tries to share about the students' futures. Ruth and Tommy become a couple, the three graduate and later travel to Norfolk, and their friendship slowly fractures under jealousy and deception. Kathy eventually leaves to become a carer, then returns to nurse Ruth through her final donations. The pool ends with the devastating revelation that deferrals never existed, followed by Tommy's death and Kathy's solitary drive to Norfolk to grieve.

The headline story of three clones growing up, falling apart, and losing each other.

Tommy approaches Kathy during a medical check-up to apologize for accidentally hitting her when she tried to calm him.

Students protest that Madame takes their best artwork without fair compensation, forcing the guardians to announce a fixed payment system.

Kathy confronts Ruth by implying that the pencil case Ruth claimed was a gift from Miss Geraldine actually came from the Sales.

Kathy buys a Judy Bridgewater cassette tape at one of the monthly Sales and becomes obsessed with a song on it.

After Kathy's cassette tape disappears, Ruth searches for a replacement and presents Kathy with a new tape as a thoughtful gift.

Ruth and Tommy have a falling out and briefly break up, throwing Kathy's own romantic plans into confusion.

Ruth approaches Kathy during a shared music-listening session and asks her to help reconcile Ruth's relationship with Tommy.

Kathy and her classmates leave Hailsham and settle into the run-down Cottages, a converted farm with no guardians.

Chrissie and Rodney tell the group that they recently spotted a woman in Norfolk who looks remarkably like Ruth.

Tommy and Kathy search Norfolk's secondhand shops and find the exact Judy Bridgewater cassette that Kathy had lost years earlier.

Back at the Cottages, Ruth discovers that Kathy and Tommy found the Judy Bridgewater tape together during the Norfolk trip.

Kathy learns from an old friend that Hailsham has closed permanently.

Kathy encounters a fellow carer named Laura slumped in a car, grieving the recent loss of a donor she had cared for.

On the drive home from a day trip, Kathy points out a roadside poster that matches Ruth's long-held dream of office work.

Tommy tells Kathy he wants a different carer for his final donation and the two share a subdued, painful farewell.

Pool 2 fills in the texture of life at Hailsham and the Cottages through the smaller moments that shape Kathy, Ruth, and Tommy without making the headline events. It traces Ruth and Kathy's complicated friendship through petty confrontations and genuine acts of kindness, while following the brief collapse and repair of Ruth and Tommy's relationship through Kathy's mediation. The move to the Cottages brings new uncertainties, and the trip to Norfolk produces one of the story's most bittersweet scenes when Tommy and Kathy find Kathy's long-lost cassette together. The pool moves through the quiet years of Kathy's carer life, the gentle melancholy of a day trip to see a stranded boat, and a roadside moment that forces Ruth to confront her buried dreams. It closes with the painful simplicity of Tommy and Kathy's final farewell.

The quieter moments of friendship, loss, and small discoveries behind the main story.

Ruth invites Kathy into a secret guard of girls pledged to protect Miss Geraldine, marking the true beginning of their friendship.

Kathy accidentally enters a classroom and finds Miss Lucy furiously scratching out pages of neat handwriting in obvious distress.

Miss Lucy pulls Tommy aside and tells him she was wrong to dismiss his art and that creative work is meaningful evidence.

During a Norfolk café stop, Chrissie raises rumors of a deferral for couples in love and Ruth bluffs her way through the discussion.

Ruth delivers an angry speech claiming that clone donors are modeled on the most unwanted and discarded people in society.

Tommy reveals to Kathy his theory that Hailsham artwork was collected as evidence to support deferral applications for couples in love.

Tommy shows Kathy his secret notebook of imaginary creatures, drawn in hope the art might one day support a deferral application.

Ruth provokes Tommy by revealing Kathy's private mockery of his animal drawings, deliberately driving a wedge between all three friends.

Kathy becomes Tommy's carer after his third donation and the two begin the romantic relationship they have long delayed.

Kathy sits beside the dying Ruth in hospital and promises that she will seek a deferral together with Tommy.

During the visit to Madame's house, Madame weeps at Tommy's animal drawings before opening a door to reveal Miss Emily in a wheelchair.

Miss Emily explains that the Morningdale scandal, in which a scientist tried to create enhanced clones, destroyed the movement to protect donors.

Outside Madame's house, Madame tells Kathy that seeing a girl dancing with a pillow once reminded her of the cruelty of the world.

After leaving Madame's house, Tommy asks Kathy to stop the car and then walks into a dark roadside field and screams.

Kathy pulls over beside a barbed wire fence in Norfolk and imagines Tommy's distant figure walking toward her across an open field.

Pool 3 focuses on the moments of discovery and decision that shift the characters' inner lives, even when the outer world stays the same. It opens with the small act that begins Ruth and Kathy's genuine friendship and moves through Miss Lucy's private distress and her surprising second conversation with Tommy about the true importance of his art. The pool captures the contradictions of the Norfolk trip — hope raised by deferral rumors and then crushed by Ruth's angry outburst about who clones are really modeled on — and the slow poisoning of the trio's friendship when Ruth turns Kathy's private words against Tommy. The final sequence moves through Kathy and Tommy's belated romance, their shattered deferral hopes, and the private revelations exchanged with Madame and Miss Emily. It ends with Tommy's raw, wordless grief in a dark field and Kathy standing alone at a barbed wire fence in Norfolk.

The hidden turning points and revelations that change what the characters understand about themselves.