Lidia Achour returns to Peranne following the disappearance of her former partner, Jean Benefro. In addition to Jean's disappearance, a series of gruesome murders pushes Lidia to investigate relentlessly, at the risk of awakening a painful past that everyone thought buried.
A dark world of well-organised drug crime is hidden behind the calm life of Brabant. Jara and Rens both come to discover that when upon return to their birth province after a long time. She wants to clear the name of her father, he wants to distance himself from his criminal family - but they both get terribly entangled in the web of the upper and underworld, whose boundaries are becoming increasingly blurred.
Imamiya (Fumino Kimura) is a detective who deals with fraud and scam cases. She arrests Kaji (Mahiro Takasugi), who is involved in a voice phishing case. Imamiya and her colleagues do not know who is at the top of the voice phishing group. Detective Tezuka (Kenichi Endo) suggests that they should let Kaji walk free and see if he will lead them to the top of the group.
When teenager Silas is found dead at a farmhouse on the Bjäre peninsula – the perpetually angry, odd but highly intelligent investigator Dani (Krista Kosonen) is teamed up with newly graduated police colleague Malik (Mohammed Nour Oklah) to investigate the case. The investigation leads Dani and Malik into a patriarchal rat-hole on the Scanian countryside and they soon find themselves at the center of a dark family feud that has been going on for generations. Dani, who has a personal connection to the victim Silas, is drawn deep into the investigation and the families it centers around. The Patriarch Elis (Peter Gantman) gives Dani a deadline to solve the case before taking matters into his own hands within the family. Synden is a modern crime set in an uncertain world of conflict and violence where the original sin is constantly present.
A Danish group of guys sing in a church choir on Sunday, but indulge in God's forbidden pleasures every other day. When one of them drowns under mysterious circumstances, their unity and loyalty to one another is put to the ultimate test.