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Ulla, a teacher from Roskilde, has celebrated her 30th birthday with a big party among friends and relatives. On her way home from the party she disappears without a trace. Her husband calls the police and Unit One is summoned. Evidence indicates that a crime has taken place, and Ulla's children also face danger. Ingrid is in an awful state following Søren's death and has incarcerated herself. Gaby and Johnny try to help, but in vain. However, IP has his own way of tackling Ingrid. Fischer receives a tempting offer from Ulf.

When an elderly lady is murdered in Nakskov, details emerge from her younger female lodger, who says she saw an unfamiliar man leave the house just after the crime. Fischer's relationship with the local force is complicated because of a previous case and the conflict between them resurfaces. IP is worried about Kirsten's whereabouts, and Ingrid's husband Søren surprises her just as she is on her way out with Boysen.

The Indian has kidnapped Gaby, and La Cour and Fisher is on their tail, IP is trying to protect The Indian's ex-girlfriend who are also the murdered student's sister; this dramatic episode was supposed to be the end of the series, but as you can see below, two episodes were added later.

A young couple's wedding day is ruined by a murder. The killing seems unfeasible and the forensics experts are perplexed when Unit One arrives. Soon, many of the villagers are under suspicion. While IP's jealously grows, Johnny receives help from Gaby with his personal problems. Søren puts pressure on Ingrid to make a decision about their relationship. But all could be futile when Ingrid soon after receives a phone call from the hospital alerting her that Søren is in a serious condition.

The body of the 10-year-old is found in a stream in the woods just outside of Hellebæk. No boy of the description is missing. La Cour dreams of a bag that is found at the harbour and has exactly the same interior as in La Cours dream. A social licence from the bag reveals the boy to be Martin Simonsen. DNA samples proves that the killer earlier has murdered a young boy. La Cour talks with a conductor from Odense, Claus Munk Andersen, who claims he didn't see the boy. But through a vision and investigation of other witnesses, Andersen is taken into custody. A DNA sample proves him to be the killer, but when the police moves out to arrest him, they find him hanged in his house and La Cour's fingerprints all over the place.

La Cour gets one of his visions and finds a murdered student at one of the most prestigious boarding schools in Denmark, this involves the unit in a case where they finally get clues to find the serial killer known as The Indian (because he cuts the pubes off his victims); meanwhile, Ulf has bad news for the team.

La Cour is taken into custody and is ordered home to Copenhagen. In the mean time, the investigation team contacts Karin, the sister of Andersen who tells them that the man that visited Andersen the night he was killed and had sexual intercourse with him probably is Sonny, a local male prostitute. Fischer is sent to the dumpster, where he finds a trash bag that contains Andersen's diary that contains information about the murdered boys and Cliff "Sonny" Jensen, whom Andersen raised into prostitution and lent to his friends. La Cour notices some ash buds and remembers what happened at Andersen's, paying Ulrik Gregersen, Andersen's brother-in-law a visit. He follows him to the dumpster where he arrests him and discovers that the trash bags he dumped there contained the body of Sonny.

A hotel is set on fire in Nyborg, killing 32 people. A local pyromaniac, Henning Jørgensen, is taken into questioning, but fails to answer where the fire started. In a side story, a little boy witnesses how a bespectacled man places the corpse of a young woman on a bench in a parking lot. In a picture from the local newspaper, a face is very faintly viewed in the background, and the police trace the person in the picture to be Otto Lykke Larsen, a mentally retarded man. Larsen is taken into questioning. In the videos found in Larsen's apartment, fires are videotaped and Unit One suspects that Larsen was the pyromaniac responsible. In other videos, Larsen has sexual intercourse with a woman, Britt Hjort Jespersen. In questioning, Larsen admits that he was the one who set fire on the hotel, along with all the other fires recorded in his videotapes. In the mean time, the corpse of the young woman is identified as Jespersen. Larsen admits he killed Jespersen.

A young girl is found murdered on Bornholm and the unit is quickly involved as it looks like the work of one of Denmark's infamous serial killers, known as The Indian; unfortunately, the story spins into a personal tragedy for Ingrid.

When Johnny finds a couple of Polish girls in the back of a truck near Slagelse the unit is getting involved in a case of human trafficking and quickly tie it to the Polish mafia.

Jette Møller is found murdered in a fish boutique in Vordingborg. Finn Møller, her husband, is taken into custody, but nothing is gaining out of his answers. Her phone is tapped and when a suspicious phone call remind Fischer and La Cour about Strangers on a Train, Møller is put under surveillance. He escapes when he sails from Vordingborg to an island. The following day, the body of Putte Bech Lorentzen is found in a sauna. Unit One suspects Larsen and arrest him. Through evidence found in the garden of Bech Lorentzen, Unit One arrests Bertram Bech Lorentzen, the husband of Putte, for the murder of Jette.

A lawyer with a history of getting defendants to retract confessions uses the technique to exonerate the perpetrator of a crime that the team previously investigated. Then the lawyer and his family are threatened by an unknown attacker and the team is called in to protect him.

The owner of a chocolate factory is found murdered. Did his murder have something to do with his appetite for young women and kinky sex, or is there something else at play?

A psychology student meets up with one of her regular chat friends. After she disappears it takes six months before Unit One is on the case.

Just released from prison the entrepreneur called farmand (daddy-o) is found murdered in a Danish train to Århus, which puts the unit smack in the middle of hypnosis and crime and they meet one of the smartest criminals in the series so far. Kaare commits a robbery just after being released from State Prison in Horsens. He shoots three people and is arrested by Fischer. Unit One suspects that Ivan has masterminded the coup.

The tragic case of Kaare and Ivan continues, who will break first the police or Ivan?

An entire family is brutally murdered and the case leads the unit into a tragic story of incest and violence.

Christian and Andreas Dahl are shot when they confront two famous criminals in burying stolen money in Kalundborg. Tina Lauritsen, the wife of Christian, is later found with her throat slit. The criminals are quickly identified, as a burned out white Mercedes is found containing rabbit dung (as Eik Nielsen, the male criminal, favours white Mercedes and Anja Jespersen, the female criminal, always carry around a rabbit). Unit One puts the area where the money was buried under surveillance. When the couple shows up, the Special Police Corps surround them, but they manage to escape into the church where a small group of people were arranging baptising schedules. Eik lets the grown ups escape and the priest, the wife of a local police officer, manages to text message Unit One and ask them to open the Northern Door to let Anja escape with the infant. The Special Police Corps manages to successfully rescue the priest and take Eik into custody.

Unit One is called to Aabenrå when parts of a woman body is found in Knapsø. As Unit One checks the German Missing List, a witness tells of a silver Audi from where a man tossed a trashbag into the harbour, and of a burning container filled with personal files on a Doris Fröse. The owner of the silver Audi, Manfred Schlosser, lacks any information. A summerhouse owner contacts them and tells that the sheets and beddings have been replaced and the floor scrubbed very thoroughly. Blood samples confirms the victim to be Doris Fröse, but the name of the man who borrowed the summerhouse is fake. A friend of Doris Fröse confirms that the man whom Doris Fröse was visiting in Denmark was Manfred Schlosser. In the mean time, Pernille, the wife of Manfred Schlosser, finds knives and photoalbums of many murdered women in the attic. Manfred finds out and drowns her in their bathtub. Manfred is taken into custody, but denies everything.

Bertel Kjeldsen calls Dahl late at night to ask her to come to Fredensborg where he allegedly killed his own wife. In the meantime, the case of Britt Hjort Jespersen is brought up again as a poor autopsy of the body wasn't satisfactory. DNA samples from a new autopsy show DNA from another man. Dahl tries hard to find Keldsen, who is standing at the edge of a tall building when Dahl finds him. He tells how he killed his wife and how his son, Knud Kjeldsen, killed Jespersen. Dahl arrests Knud. Knud lies under questioning, but the DNA samples show that Knud's biological brother, Robin Hansen, who is mentally retarded, was the murderer. Knud tried to cover for his retarded brother to spare his family.

A woman dies in a house fire. Her 8 year old daughter fights for her life in hospital. Was the fire an accident or arson?

Local police overhears a shooting. A teenage girl comes running against them yelling "They're gonna kill me, they're gonna kill me!". The female police officer finds the body of Irana and Fashad Adavi in the apartment of Osmand and Leyla Güre. The reason for the murder is believed to be a matter of honour according to Osmand as he explains that Fashad supposedly has raped Yasemin, the daughter of Osmand and Leyla. The son, Dennis, supposedly shoots Fashad as he refuses to marry Yasemin. In questioning, Dennis fails to reload the pistol and is therefore not the murderer. Yasemin then claims she shot the victims. In a gynaecological examination, Yasemin proves to be a virgin. As the gynaecologist talks with Dahl, Yasemin escapes and, according to her home room teacher, hides in a botanical facility. The teacher explains that Osmand has sexually abused his daughter anally for years. IP finds the girl in time, as her father is trying to kill her with a piece of glass. In questioning, Yasemin explains that Fashad found out about her father and tried to force through a wedding with Osmand, who then kills her.

A young boy is kidnapped on his 9th birthday. The team discovers him alive and well, but getting him back to his mother is not simple. Ulf and Kirsten take a trip to London.

When local crime boss Bob is found murdered in his own S&M dungeon in a custom made monkey cage in Fredericia, the unit is involved in a case of revenge and jealousy.