Unit Ones five criminal investigators are unexpectedly sent out to investigate a tragic crime of one of their own. When the national police headquarters are forced to make some changes among the small and firmly established team, the temper of several members reach a boiling point. It becomes a case with big consequences also for some of the investigators personal life.

A man has been liquidated while Ingrid, IP, Fischer, la Cour and Gaby must get moving an early Saturday morning. The killed person is known by the police force and had trouble with a local biker gang. But Ingrid believes that the reason for his death is of a private matter. The big mobile office trailer has been taken into action, while the driver is a surprise.

Fischer and la Cour manage to grab the leder of the biker gang Grue, who is driving around with a sawn-off shotgun. Ingrid returns with a plan, which doesn't suit Ulf or the local superintendent of police. Fischer gets unexpected help, when he gets into a violent struggle with a few of the suspects. IP is suffering jealousy, while something is brewing between Gaby and the driver Johnny Olsen.

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.

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.

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.

Fischer and La Cour have taken a holiday on the North Sea with Fischer's family. Their holiday is soon ruined when the local force receives an anonymous tip-off that a homicide has been committed in the neighborhood. The murderer is at large and could strike again at any time. Ulf is summoned when Fischer loses control while detaining a subject.

An entire region is frightened, when a hooded man over a longer period of time has committed an offence on elderly women. Unit One is called in and thus la Cour is forced into a painful reunion. IP is having difficulty with Kirsten and gets a flattering invitation, which will cost him dearly. Fischer by chance gets new insight into Johnny's private life.

The hooded offender, who assaults elderly women manages to strike again. But how can he constantly be one step ahead of the investigation? Ulf arrives demanding result and is at the same time confronted by IP. La Cour finds a crucial clue, but is it in time?