The iconic Øresund Bridge, standing in the strait between Sweden and Denmark, connects the cities of Copenhagen and Malmö. When a body is discovered lying directly across the line that divides these two countries a union between the respective cities’ Police forces is forged and a working relationship between two very different detectives begins. Laid-back but louche Danish family man, Martin Rohde (Kim Bodnia) and the socially awkward, classic-Porsche driving Swedish singleton, Saga Norén (Sofia Helin) have to work together to stop a chain of horrificly staged murders before a terrorist wins over public opinion with his anti-corruption agenda. As the case develops so does the relationship between Martin and Saga, culminating in one of the most dramatic conclusions to a TV series in recent memory.
13 months later a deserted tanker veers off course, heading straight for the Bridge, the scene of the now-infamous crime that first united the two detectives. When the Coast Guard finally board the ship they discover there is no crew present but find three Swedish and two Danish youths chained below deck. Saga is immediately put in charge of the case but, as Danish victims are involved, she contacts her previous case-collaborator, Martin who is still suffering the psychological consequences of the previous case. The duo embark on investigating a mysterious and complex case involving terrorists with an environmental agenda.