A young Spanish-Finnish couple is found murdered in cold blood in the Oulu region. Hilkka Mäntymäki (Riitta Havukainen) and the "new sheriff in town" Jami Kalliola (Juho Kuusamo) start investigating the case.
Hilkka's team is reinforced by Luisa Salinas (María Romero), flown in from Spain. The investigation leads the police to a transport company specializing in the waste business. One by one, Andrés Villanueva angers his loved ones.
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 his wake. Hilkka and Luisa find barrels full of radioactive mining waste in a storage area abandoned by the military. Andrés meets a man from his past in prison.
A criminal investigation that began in Finland becomes increasingly dangerous as it moves deeper and 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?
