School counselor Ms. Dobbins warns Florence about Dylan's violent outbursts, including hitting a classmate with a cricket bat.

American lawyer Jenny Choi introduces herself to Florence at the St. Angeles school gates and they exchange numbers.

Florence receives frantic texts from the school moms group chat and rushes to find St. Angeles on police lockdown.

Florence forces her way past police into the locked-down school and sneaks Dylan out through a back entrance.

Dylan confesses he answered for Alfie at roll call on the bus, concealing Alfie's disappearance until the bus returned to school.

Florence searches Dylan's room and finds Alfie's missing backpack hidden under Dylan's bed.

Florence reads Alfie's journal entry claiming Dylan threatened to kill him, then burns the journal in a panic.

Florence is arrested while attempting to enter the cordoned-off Wetland Centre to plant Alfie's backpack.

After an unsatisfying parents' meeting and police briefing, Jenny agrees to investigate Alfie's disappearance alongside Florence.

School maintenance man Mr. Papasizi tells Florence to ask Ms. Schulz about Mr. Sexton, a teacher fired for allegedly groping Alfie.

Florence breaks into Mr. Sexton's house posing as a water company employee and plants Alfie's backpack and photos of students.

Florence calls an anonymous police tip line claiming to be a cleaner who discovered Alfie's backpack in Mr. Sexton's home.

Mr. Sexton is arrested and police inform Florence they no longer need to formally interview Dylan as a suspect.

Florence wakes unable to find Dylan and discovers a letter through her mail slot with a Cornwall address and a death threat.

Jenny enters Adam's Cornwall cottage and shoots him with his own gun after he beats Florence for freeing Alfie.

When 10-year-old Alfie Risby vanishes during a school field trip, washed-up pop star Florence Grimes fears her son Dylan is responsible after finding Alfie's backpack hidden under his bed. She burns a journal entry that implicates Dylan and is arrested when she tries to plant the backpack at the crime scene. Teaming up with sharp-tongued lawyer Jenny Choi, Florence begins an amateur investigation that leads her to a disgraced former teacher named Mr. Sexton. Convinced of his guilt, Florence breaks into his house and frames him for the kidnapping, planting false evidence that leads to his arrest and clears Dylan as a police suspect. The real perpetrator is much closer to home: Florence's neighbor Adam, a corrupt police officer, kidnapped Alfie to extort a ransom and had also accidentally killed his girlfriend Marta. Florence confronts Adam in his Cornwall cottage, frees Alfie, and survives a brutal attack before Jenny ends the threat by shooting Adam with his own gun.

The headline events of Alfie's disappearance and Florence's desperate investigation.

Florence rushes past her elderly neighbor Mr. Foster as she takes Dylan to school, missing what he wanted to tell her.

Florence recognizes her wealthy former bandmate Lacey among the guests at a balloon arch delivery in Notting Hill.

After the humiliating encounter with Lacey, Florence flees to a pub and has anonymous sex with a stranger in the bathroom.

Florence shoplifts an expensive bodysuit from Selfridges while simultaneously receiving frantic texts about a school emergency.

Florence's ex-husband Will arrives to collect Dylan for the week after Alfie's disappearance shuts down St. Angeles.

Florence convinces a distracted police officer to return her bag unsearched by giving advice about an online shopping cart.

Florence and Jenny attend the St. Angeles vigil where Florence spots a tearful Ms. Schulz standing apart from the crowd.

A cricket ball with a note reading 'Mind your own business or else' is thrown through Florence's front door window.

Jenny and Florence disguise themselves as toddler snack saleswomen and go door-to-door searching for Ian's apartment in the Barbican.

Florence blows their cover at a hardware store when a paint can falls onto a stroller containing a plastic baby doll.

Florence knocks on Adam's door to complain about sludgy plumbing and discovers Jenny inside, having slept with him.

A woman named Zofia arrives at Florence's door searching for her sister Marta, who never actually returned to Poland.

Florence dials Marta's phone number and hears it ringing from inside Adam's upstairs apartment.

Florence attempts to report Adam to police but is turned away because complaints against an officer require a different department.

Florence is discharged from hospital in time for Christmas and celebrates with Dylan, Jenny, and Jenny's twin boys.

Before Alfie goes missing, Florence's chaotic Friday includes a humiliating run-in with her wealthy former bandmate Lacey, an anonymous pub encounter, and shoplifting from Selfridges — all before the school emergency pulls her back into crisis. As the investigation unfolds, Florence and Jenny blunder through surveillance techniques, posing as toddler snack saleswomen at a London apartment complex and spectacularly blowing their cover in a hardware store with a plastic baby doll. Alongside the comedy, darker threats accumulate: someone throws a cricket ball with a warning note through Florence's front door, and Florence later makes the chilling discovery that Adam has been holding Marta's phone in his flat. Florence tries but fails to get the police to act against one of their own, and her attempts to warn Jenny are dismissed as jealousy. The pool closes on a note of hard-won warmth, with Florence discharged from hospital in time for Christmas to celebrate with Dylan, Jenny, and Jenny's twins.

The comic misadventures and secondary moments that shape Florence's journey.

Florence privately admits Dylan is an unusual child with a frightening all-or-nothing sense of right and wrong.

Florence learns that music executive Elliot has called with a potential opportunity to restart her stalled pop career.

Jenny calls Florence to ask whether Alfie's disappearance is connected to a past groping incident at St. Angeles.

Ms. Schulz meets Florence and Jenny for tea at the Ritz and reveals that Rollo Risby has a secret son she spotted at the vigil.

Ian tells Florence and Jenny at his warehouse performance that he has an alibi and implies he knows Ms. Schulz far better than she admitted.

Detective Singh calls Florence to say police now want to formally interview Dylan in connection with Alfie's disappearance.

Florence encounters a disheveled Cleo Risby on the night bus, who shows her a drawing purportedly sent from Alfie after Mr. Sexton's arrest.

Ian tells Florence at a bar that Ms. Schulz is his aunt who tried to secure his inclusion in Rollo's will.

Florence goes downstairs at 2am to find Dylan fully dressed with shoes on in the kitchen, claiming he just wanted water.

Ms. Schulz reveals that Rollo impregnated her teenage sister and refused to acknowledge the child, driving the sister to suicide.

Ms. Schulz tells Florence the groping allegation against Mr. Sexton was fabricated by the Risbys as revenge for failing Alfie on an exam.

Florence learns from a salon owner that Marta had been secretly having an affair with Rollo Risby before she disappeared.

On the drive to Cornwall, Jenny admits she warned Adam that Florence suspected him of involvement in Marta's disappearance.

Adam reveals he learned about the Wetland Centre field trip from Dylan and used that information to plan Alfie's kidnapping.

Florence watches a news report identifying Mr. Foster as an eco-terrorist and realizes Dylan has been sneaking out at night to participate.

From the outset, Florence privately acknowledges that Dylan's explosive moral certainty makes him capable of frightening behavior, a fear that deepens when Jenny calls to ask whether Alfie's disappearance is linked to an old groping allegation at the school. The investigation peels back layers of deception: Ms. Schulz reveals Rollo has a secret son named Ian, and Ian later confirms that Ms. Schulz is his aunt who had been maneuvering to secure his inheritance — making the Risby family a web of buried scandals. A chance encounter with a disheveled Cleo Risby on a night bus, who produces a drawing apparently sent by Alfie after the wrong man was already arrested, forces Florence to confront the consequences of what she has done. The truth about Ms. Schulz's sister — driven to suicide after Rollo refused to acknowledge their child — reframes the entire world of St. Angeles as one sustained by cruelty and cover-ups. When Florence finally reaches Adam in Cornwall, he reveals that Dylan unknowingly gave him the information to plan the kidnapping, and the novel closes with Florence realizing Dylan has been sneaking out to participate in Mr. Foster's eco-terrorist nail bomb campaign.

The key discoveries and emotional shifts that unravel the mystery's hidden layers.