Finnish family is found brutally murdered on the Spanish coast. Criminal investigator Hilkka Mäntymäki is sent to investigate the case.

A man with a tattoo of the ice hockey team Oulun Kärpät on his arm is found murdered on the Spanish Sunshine Coast. Hilkka Mäntymäki's peaceful quality time in Finland is interrupted when Luisa Salinas, who is leading an investigation in Spain, sends Hilkka a call for help.

Andrés Villanueva's visit to Finland takes a new twist when he joins Hilkka and Kim in their investigation. Timo, a young sporting talent, receives unpleasant news about his health. Meanwhile, a young African couple smuggled into Spain end up with questionable people.

Hilkka, Andres and Kimi arrive in Spain to help Luisa. The strange connections between the Finnish entrepreneurial couple Sohanna and Petteri also arouse suspicion among other Finns on the Sunshine Coast. A discovery at the waterworks makes the team realise that a larger crime is at stake.

The link between Chief of Police Corea and the events is a cause for concern for Luisa. How are Corea and the murdered man from Oulu connected to Sohanna and Petteri, a Finnish entrepreneurial couple? Luisa does her own research into Coréa's background and is not satisfied with her findings.

Luisa and Hilkka receive a clue that leads to a massive search. But the tentacles seem to be creeping in many directions, and no one is willing to talk. Relations between the Finns on the Sunshine Coast are becoming increasingly tense. Luisa is confronted by an unpleasant person from her recent past who complicates her work.

Andres follows a lead to Melilla to meet up with old acquaintances. Hilkka and Luisa weave a plot to find the main players in the criminal gang. But the new discoveries cause more despair. Neither of them has any idea that Hilkka could also be in danger.

The hunt to catch criminals leads to disappointment. With a new chief, things start to get tough for Luisa. Her decisions are questioned and results are expected. Hilkka's private life is rocked and she is faced with difficult decisions.

Hilkka returns to Finland, but the race to catch the criminals continues. The interrogations of Sohanna and Petteri create unexpected pressure, and eventually someone has to speak out. When the background of the criminal gang is finally revealed, the investigators must once again weave a plot that also requires Hilkka's input.

A Spanish-Finnish couple is found murdered in cold blood in the Oulu region. Hilkka Mäntymäki and the "new sheriff in town" Jami Kalliola start investigating the case.

Hilkka Mäntymäki's team is strengthened by the arrival of Luisa Salinas, flown in from Spain. The investigation leads the police on the trail of a transport company specialising in the waste business.

Hilkka, Luisa and Andrés arrive in Gran Canaria to raid a container that has left Finland. Jami Kalliola continues to investigate the case in Finland. The murders reveal a link to a professionally run smuggling business.

The killer leaves more bodies in their wake. Hilkka and Luisa find barrels full of radioactive mining waste in a storage area abandoned by the army. Andrés meets a man from his past in prison.

A criminal investigation that started in Finland becomes increasingly dangerous as it moves deeper into the rock-hard heart of the Canary Islands' underworld.

Hilkka tracks down the killer and the forces behind the smuggling plot are revealed. An internal threat endangers the life of a witness and the entire investigation - will Andrés and Luisa get there in time?