Christian, ministre de la Santé, est submergé de problèmes politiques et personnels quand il découvre que quelque chose de sinistre se propage dans sa ville, provoquant une vague de chaos dévastatrice.

瑞典大选前夕，执政党和大企业之间达成的秘密协议，与反对移民的政党之间表面竞争，暗则互不干涉互相帮衬。在权力的游戏中有上必有下，因此引发争议……

Season 2 begins 13 months after the events of the first season. A coastal tanker leaves the Öresund waterway and is headed straight for the Øresund Bridge. When the Coast Guard board the ship they discover there is no crew, and three Swedish and two Danish youths are chained below deck. Saga Norén, County Police, Malmö, is put in charge of the case and contacts Martin Rohde, who is still haunted by the death of his son. Soon it turns out the chained youths were just the beginning... Someone wants to direct our attention to the changing climate and the use of our planet's resources, and will stop at nothing to do it. It all turns into a race against the clock to prevent a disaster where many lives are at stake...

When a well-known gender theorist, and owner of Copenhagen's first gender-neutral preschool, is found murdered at a construction site in Malmö, Saga has to cooperate with a new Danish colleague, Hanne, who has difficulty accepting Saga.

In the fourth season, a woman is found brutally murdered on a small artificial Danish island close to the Øresund Bridge. The woman is Margrethe Thormod, Thormod, Director General of the Migration Agency in Copenhagen, who was recently embroiled in a deportation scandal. Danish detective Henrik begins to investigate the murder without the involvement of Saga, due to the fact that she has now been imprisoned for the murder of her mother. Henrik is missing his colleague and wants to visit her as often as possible so she can help with the case. However, her predicament renders her unable to help. Henrik’s search for his missing daughters is also frustrated by Saga’s imprisonment and he gets close to giving up.