Shar tricks Leah into giving her £30, pretending she needs a cab to reach her hospitalized mother.

Leah visits an abortion clinic and terminates her pregnancy without telling her husband Michel.

Leah tracks down Shar's squat and pushes addiction recovery leaflets through the mail slot of apartment 37.

Leah and Michel overhear at a carnival party that a man named Felix Cooper has been fatally stabbed nearby.

Felix Cooper wakes beside his girlfriend Grace, who urges him to list what he wants from life.

Felix visits his former lover Annie, sleeps with her one last time, and ends their relationship for good.

Two men from a train argument mug and stab Felix on the street; he dies as Grace's bus departs.

As children, Keisha pulls the nearly drowned Leah from a pool, creating the bond that defines both their lives.

At Bristol, Keisha renames herself Natalie and begins pursuing her wealthier Italian classmate Frank De Angelis.

Natalie and Frank marry; Natalie begins working as a barrister while Frank joins an investment firm.

Natalie secretly begins signing up to websites for casual sex and pursuing affairs behind Frank's back.

Frank discovers Natalie's secret email account, confronts her about her hidden life, and she walks out.

A distraught Natalie wanders the streets of NW and encounters her old schoolmate Nathan Bogle, who gives her drugs.

Natalie stands on Hornsey Lane bridge, a notorious suicide spot, and contemplates jumping but ultimately does not.

Natalie and Leah conclude that Nathan is likely responsible for Felix's murder and call the police to report him.

The novel opens in northwest London as Leah Hanwell is conned by a woman named Shar, an event that quietly unravels her marriage and mental stability. While Leah hides a secret abortion from her husband Michel and spirals toward breakdown, the novel pivots to Felix Cooper, a man determined to leave his troubled past behind. Just as Felix reaches a turning point in his life, he is murdered after a trivial argument on a train. The third strand follows Natalie Blake, Leah's lifelong friend, whose outwardly successful life as a barrister and mother conceals a secret life of affairs that her husband Frank eventually uncovers. After Frank's discovery, Natalie walks out and wanders through the old neighborhood, nearly taking her own life on a bridge. The novel closes as Natalie and Leah reconnect in crisis, piece together who killed Felix, and call the police.

The headline events driving NW from first encounter to final reckoning.

Leah invites a distressed stranger named Shar into her home and listens to her convoluted story over tea.

Leah grabs Shar on the street and Shar admits she is a penniless addict, refusing any offer of help.

Michel shouts at a man he thinks is Nathan, who shoves him and kicks their dog Olive.

Michel and Leah attend a dinner party at Natalie and Frank's, feeling out of place among barristers and bankers.

Leah and Michel find their dog Olive dead the next morning; Leah begins attending church daily to cope.

Leah collects developed photographs and becomes hysterical, convinced she can see Shar among her own pictures.

Felix visits his father Lloyd, and the two look through a photo book of the old Garvey House together.

Felix negotiates the purchase of a damaged MG sports car with Tom Mercer, talking the price down at a pub.

Young Keisha and Leah grow close at Brayton Comprehensive, developing distinct personalities and diverging interests.

Leah takes the number 37 bus to Camden Lock instead of attending church with Keisha, marking a growing drift between them.

Marcia discovers the vibrator Leah gifted Keisha and enforces a ban on their friendship lasting over a year.

Keisha attends Bristol with boyfriend Rodney but feels profoundly alienated from the other students' backgrounds and concerns.

Frank's mother Elena offers Natalie the money she needs for her legal apprenticeship after Marcia's savings are lost in a scam.

During their drug-fuelled night walk, Natalie confronts Nathan about whether one of the girls he deals with is Shar.

Michel finds Leah's hidden birth control pills, is devastated, and calls Natalie demanding she come and help.

Before the con, Leah invites Shar into her home and listens sympathetically to her story — an act of trust that sets everything in motion. The mounting pressures in Leah's life take physical form as threats escalate from a phone call to a street attack to the death of her dog Olive. Felix's day is fleshed out through his visit to his father Lloyd and a savvy negotiation over a secondhand car, revealing the person he has worked hard to become. The backstory of Leah and Keisha's friendship is traced from their Brayton school days through the year Keisha's mother forcibly separated them, shaping each girl's sense of herself. Natalie's rise from Bristol to the London bar is complicated by a lost inheritance and a crucial loan from Frank's mother. The pool ends with Michel's anguished discovery of Leah's hidden contraception, the trigger that finally draws Natalie back into her oldest friendship.

The everyday pressures, confrontations, and quiet decisions that push each character toward crisis.

Leah and Michel spot Shar in a pastry shop and try to stop her, but she runs out the door.

Leah receives a threatening phone call warning her to stop looking for Shar, which she suspects comes from Nathan.

Michel signs himself and Leah up for fertility treatment while Leah secretly continues taking birth control pills.

A flashback reveals that Felix and Grace first met at a bus stop, a meeting Grace considers fate.

Felix quietly declines when his father Lloyd offers him marijuana, showing how seriously he takes his sobriety.

Felix cheerfully tells friends on the street that he is in love with Grace, moments before he is attacked.

As a child, Keisha becomes acutely aware of the class gap between her working-class family and Leah's middle-class household.

Leah gives Keisha a vibrator for her 16th birthday, awakening an intense and analytical curiosity about her own sexuality.

At Bristol, Keisha sheds her religious faith and her birth name, fully reinventing herself as Natalie.

Frank makes controversial comments at a student dinner; he later apologizes to Natalie and they begin a relationship.

Natalie is molested by her employer Johnnie Hampton-Rowe, then mentored by Theodora Lewis-Lane who advises her to avoid low-status cases.

Natalie and Frank have two children, but Natalie feels deep and unspoken ambivalence about motherhood alongside her career.

Natalie unexpectedly runs into Nathan Bogle while going about her daily life, unsure how to speak to him.

Natalie realizes she has been subconsciously heading toward Hornsey Lane bridge, a famous suicide spot, the entire evening.

Natalie comforts the distraught Leah and, in doing so, realizes she wants to return home and reconcile with Frank.

The roots of each character's crisis stretch back to childhood — Keisha's dawning awareness of class, her awakened sexuality, and the single bus ride that begins to separate her from Leah. Felix's sobriety is a hard-won achievement quietly demonstrated through small acts of refusal, and his final moments of happiness before being killed show how much he had changed. In college, Natalie's reinvention of herself accelerates through a name change, a lost faith, and a new relationship with Frank, though her path is marked by exploitation and difficult advice. By the time Natalie is a successful lawyer and mother, her restlessness has deepened into crisis, culminating in a night-time wandering that leads her, without quite knowing why, to a bridge. The pool closes with Natalie arriving at Leah's side and realizing, through her friend's pain, that she wants to go home to Frank.

The hidden decisions, discoveries, and emotional shifts that quietly determine everyone's fate.