Before the Frost

The novel is part of Henning Mankell's Kurt Wallander mystery series, set in the town of Ystad in the southern Swedish province of Skåne. It shifts the focus to Linda Wallander, the detective's daughter, while continuing her father's story.

A prologue set in November 1978 follows an unnamed man fleeing through the Guyanese jungle after the mass suicide at Jonestown, the settlement of Jim Jones's People's Temple cult. The man was away searching for runaway cows when Jones ordered his followers to be poisoned or shot. Jones fires at the man but misses. After hiding overnight, he returns at dawn to find Jones dead and discovers his partner Maria and their daughter shot dead, Maria struck in the back while trying to flee with the child. He stays beside them until helicopters arrive, wondering if he can ever fill the void that God and Jim Jones have left behind.

The story proper begins in August 2001. Linda, nearly 30, has graduated from the police training college in Stockholm and waits to begin her posting at the Ystad police station on September 10. She stays in the flat of her father, Inspector Kurt Wallander. During the idle summer, she reconnects with two childhood friends: Zeba, a single mother of Iranian descent with a toddler son, and Anna Westin, who says she is studying medicine in Lund. Linda's backstory includes two suicide attempts as a teenager; one, when she stood on a bridge railing intending to jump, remains her deepest secret from her father.

One evening, Anna tells Linda she saw a man through a Malmö hotel window whom she is certain was her father, Erik Westin, who abandoned the family 24 years earlier. Erik had been a handyman who made orthopaedic sandals before vanishing. Linda is skeptical, since Anna was very young when Erik left. The next day, Anna disappears. Linda lets herself into the flat with pass keys and finds that a framed blue butterfly has vanished from the wall, though Anna's journal and prescription eczema cream remain. The journal's final entry reads only "myth, fear, myth, fear." Further back, Linda finds a notation referencing a letter from Birgitta Medberg, a local cultural geographer.

Linda visits Anna's reclusive mother, Henrietta Westin, a composer living alone in the countryside. Henrietta claims not to know where Anna is and insists Anna has been "catching glimpses" of her father since childhood. Linda is certain this is a lie and leaves convinced Henrietta is hiding something.

A parallel investigation develops. Someone has doused six swans with petrol at Marebo Lake and set them alight, suggesting ritualistic animal cruelty. When Medberg is reported missing, Linda connects the name in Anna's journal and traces Medberg to the Rannesholm nature reserve, where she discovers Medberg's hidden Vespa. Wallander rushes to the scene. Together they follow a forest path to a hidden hut in a concealed ravine. Inside, they find Medberg's severed head, her hands clasped as if in prayer, the rest of her body missing. A Bible near the hands contains handwritten alterations to scripture. The blue butterfly links the cases: Medberg owned a butterfly collection. Wallander assigns a new colleague, Stefan Lindman, to investigate the connection.

Linda discovers that Anna was expelled from medical school and has become deeply religious. A letter in Anna's mailbox leads her to a house behind the church in Lestarp, where silent worshippers sit beneath a black cross. She traces ownership to Torgeir Langaas, a Norwegian who will prove to be Westin's chief disciple, whose listed Copenhagen address proves false. When Linda visits the building, a man grabs her, warns her to stop looking for Langaas, and knocks her unconscious. The assailant, Ulrik Larsen, is eventually revealed to be a Danish church minister who preaches that abortion deserves severe punishment.

Two churches are simultaneously set ablaze. Inside Frennestad Church, investigators find the body of Harriet Bolson, an American woman from Tulsa, Oklahoma, strangled at the altar with a hawser, a heavy rope. A pendant shaped like a sandal is found on her body, and Linda connects it to Erik Westin's former trade.

The narrative reveals the Jonestown survivor as Erik Westin. After escaping Guyana, he spent nearly 20 years in Cleveland with Mary-Sue Legrande, who told him someone must carry on Jones's mission without repeating his mistakes. In Cleveland, Westin found Langaas, a Norwegian shipping heir reduced to homelessness and addiction. When Langaas asked, "Are you God?", Westin answered yes, making Langaas his first disciple. By 2001, Westin had returned to Sweden with 26 followers from multiple countries, all bearing crosses tattooed above their hearts.

Anna unexpectedly returns to Ystad, claiming she spent days in Malmö searching for her father before accepting he was not coming back. Wallander interviews her at the station, and Linda observes Anna lying skillfully about her connections to Medberg and to Frans Vigsten, an elderly Copenhagen piano teacher whose name appears in Anna's journal.

Linda makes a critical breakthrough when Zeba casually mentions having had an abortion at 15, and Anna reacts with startling hostility, calling it a sin. Linda connects the pattern: Harriet Bolson had two abortions, and the killers appear to be targeting women who have terminated pregnancies. Medberg, by contrast, seems to have been killed because she accidentally stumbled upon the killers' forest hideout.

Zeba then disappears, her toddler found alone and crying. A shopkeeper saw her being helped into a grey car by a tall man, and Linda concludes Zeba was drugged. The narrative reveals that Westin has been secretly meeting Anna since his return, converting her through paternal love, religious fervor, and intimidation. When Anna mentions Zeba's abortion, Westin uses the information to justify abducting her. Westin gives Anna a knife and instructs her to kill Linda if Linda knows too much, but Anna is torn.

Anna comes to the police station armed with the knife but cannot use it. When Anna leaves, Linda follows her to an isolated house in Sandhammaren, where she crouches beneath a window and overhears Westin briefing his followers: In 26 hours, explosives will be detonated at 13 Swedish cathedrals. Langaas captures Linda as she flees. She is blindfolded, driven to an unknown church, and locked in a vestry, a small room in the church. Anna is terrified of her father but secretly passes her mobile phone to Linda, choosing her friends over her father.

Linda calls Wallander. Working with an air-traffic controller at Sturup airport, they triangulate her location by tracking incoming flights. The phone battery dies, but the controller narrows the search to two churches.

Police storm the building. Westin grabs Anna as a shield, but as she struggles to break free, his gun discharges, killing her. Westin stares in disbelief, then flees with Langaas. Linda pulls Zeba behind a pew until the shooting stops.

Langaas dies after driving his car into a tree. A car loaded with dynamite strikes Lund Cathedral, the only attack that succeeds; the other 12 are averted through nationwide alerts. Twenty followers are arrested, but Westin remains at large. Henrietta is hospitalized, having been threatened into silence. Linda finally decodes the journal. The phrase "myth, fear" was Anna's shorthand for "my father, my father."

In an epilogue set on November 23, Linda, now in uniform, responds to a call about a suicidal 16-year-old girl on a rooftop. Drawing on her own experience on the bridge, Linda tells the girl her story. After a long conversation, the girl agrees to come down. They embrace, both sobbing, and Linda has the powerful sensation that she is hugging herself. Winter has arrived in Skåne.