No One Would Do What the Lamberts Have Done

The novel opens with a framing narrative. Detective Connor Chantree brings a battered bundle of pages to the desk of his superior, Detective Inspector "Large" Wendt, at Cambridgeshire Police. The pages arrived in a disintegrating box left at Connor's home. Large skims random sections and assumes Connor has written a novel about the Lambert family. Connor insists he did not write it and urges Large to read it, suggesting the coroner may have been wrong about a death ruled as natural causes. Large refuses, but Connor argues that two truths can coexist: the official finding and the manuscript's description of a murder that left no physical evidence. Large reluctantly agrees to read.

The manuscript alternates between two narrative modes: an unnamed first-person narrator who identifies as a member of the Lambert family, and a third-person perspective closely following Sally Lambert, a mother of two teenagers living in the small Cambridgeshire village of Swaffham Tilney. The first-person narrator withholds their identity for much of the book.

The story begins on 17 June 2024, when Detective Chantree arrives at the Hayloft, the Lamberts' home in a development called Bussow Court, to inform Sally that their neighbor Tess Gavey, a 17-year-old student, claims the family's Welsh terrier, Champ, bit her arm severely enough to leave a permanent scar. The Gaveys have gone to the police. Sally is devastated. Champ was out walking with her along a nearby waterway at the time of the alleged bite, but she is too shocked to say so. Her 18-year-old daughter, Rhiannon (called Ree), has overheard everything and is furious Sally did not defend Champ. When Sally's husband, Mark, and son Toby arrive home, Mark urges them to fight through proper channels. Sally interprets his calm as insufficient urgency and resolves to act on her own.

The family's first Welsh terrier, Furbert Herbert Lambert, died after eating a dropped peach stone. Sally's fierce attachment to her dogs is rooted in her upbringing by an emotionally abusive father. Champ has a "day song" and a "night song," both written by Sally. After Chantree's visit, Sally can no longer sing the day song without crying.

Sally seeks help in the village and encounters Corinne Sullivan, a wealthy and controversial resident who offers unconditional assistance. Witness statements in the manuscript reveal the Gaveys' pattern of cruelty and manipulation. The manuscript also recounts the Lamberts' first encounter with Lesley Gavey, Tess's mother, who viewed the Lamberts' previous home months earlier and criticized the name Furbert Herbert Lambert as disrespectful, an insult that deepens Sally's resolve to protect Champ.

That evening, Corinne drives the entire Lambert family and Champ to her Lake District mansion, leaving behind their phones and cars to prevent tracking. Tensions escalate over the following days. Mark argues they should return home; Sally refuses, unwilling to accept any risk that Champ could be seized. Corinne proposes removing Champ's microchip and reintroducing him under a new name, but Sally rejects this absolutely, refusing to erase Champ's identity. When Lesley discovers that Corinne helped the Lamberts, she sends threatening messages. Corinne replies: "Champ Lambert didn't bite your daughter... You're a liar and an unhinged psychopath" (192).

The family moves to a boarding kennels in Norfolk owned by Corinne's son, then flees again after their location is leaked on social media. Corinne drives them to a hotel in Buckinghamshire and presents a new plan: An elderly woman named Sarah Sergeant, a fellow Welsh terrier owner who has been following the campaign and contacted Corinne, offers to tell police that her own dying Welsh terrier bit Tess, clearing Champ. Sally refuses to save one innocent dog by falsely blaming another.

After Sarah leaves, Ree has a breakthrough. During the drive to Norfolk, Corinne had shared the story of Lesley's furious confrontation with a swimming pool over its timetable rules, illustrating the Gaveys' extreme vindictiveness. Ree reasons that if a real dog had bitten Tess, the Gaveys would never let that dog go unpunished by framing a different one. Therefore, no dog bit Tess at all. Lesley bit her own daughter.

Sally confronts the Gaveys at their home at 2:15 a.m. She bluffs that Tess told someone the truth. Lesley breaks down and confesses that she bit Tess to frame Champ, though she never intended to bite so hard. Sally records the confession. When Tess appears and orders Lesley to retract, Sally reveals the recording, grabs the house keys from the lock, locks the Gaveys inside, and runs. Ree uploads the recording online, where it is played over 373,000 times. Mark then reveals that Sally's sister Vicky has been trying to deliver crucial evidence: a WhatsApp message timestamped 17 June that captures Sally talking to Champ by the waterway. The bite was alleged to have occurred the previous day, but the family treats the message as proof of Champ's innocence, since the waterway is far from Bussow Court.

The narrator's identity is then revealed. The first-person voice belongs not to Ree, as readers may have assumed, but to Furbert Herbert Lambert, the deceased first Welsh terrier, writing from "Level 2," an afterlife realm where spirits retain their identities and can observe and influence the living world. Furbert reveals that during the actual bite, he threw his spiritual force into Lesley's jaw muscles, causing far worse damage than she intended. He describes the "absurdity impediment," the tendency for people to dismiss morally significant events because they seem ridiculous, as a central dynamic of the story.

Furbert provides his account of Tess's death on 29 June 2024. A small Welsh terrier appears in Tess's room and speaks, first in Sally's voice, then in his own, telling Tess that because "selfish" contains the word "fish," she is fatally allergic to herself. Tess dies of an apparent allergic reaction to fish, though the coroner finds no fish in her body. A deliberately set fire then destroys the Gaveys' home; Tess is already dead before it begins. Furbert describes this as justice and declines an offer to advance to Level 1, a realm of bliss without individuality, preferring to remain a Lambert.

The aftermath brings resolution. The Gaveys leave Swaffham Tilney. The Lamberts reclaim their beloved former home, Shukes. The village celebrates Champ's vindication at a party where everyone sings his night song. Deryn Dickinson and Corinne, former book-club rivals, relaunch the Agatha Christie Book Club. Furbert signals his continued presence by moving his orange Chuckit! balls around Shukes, and Sally finally understands he is still with her. The manuscript notably omits that Lesley and her husband, Alastair, also died in the fire, stating only that they left the village.

In the novel's closing sections, Large finishes reading. The manuscript includes commentary chapters Connor inserted, arguing it is Sally's confession to Tess's murder disguised as comedy narrated by a dead dog. Large discusses the text with his wife, Lissa, who suspects Sally is the author and advises him to drop the matter. Large finds a peach on a plate in his kitchen that Lissa did not place there, a detail he does not fully register. In a coda set in March 2025, publishers Meredith Miles and Josh Varndall debate whether to publish the anonymous manuscript. Meredith discovers that a former police officer mentioned in the text, Saul Hollingwood, now works for a company directed by Corinne, suggesting Corinne orchestrated the fire. A waiter brings Meredith a Bellini, a peach-flavored cocktail she did not order, adding to a pattern of unexplained peach-related occurrences. She reverses her position and suggests they reconsider publishing, leaving the novel's central mysteries unresolved: who wrote the manuscript, who killed the Gaveys, and whether anything supernatural is at work.