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?

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

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.

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 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.

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.

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

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.