Arctic Circle is set in the exotic polar region, amidst the icy landscapes of Finnish Lapland. Finnish policewoman, Nina Kautsalo, finds a nearly dead prostitute in an old cabin in the wilderness. Criminal investigation takes a surprise twist, when a deadly virus is discovered in the prostitute’s blood sample. A German virologist, Thomas Lorenz, travels to Lapland to investigate the virus. Nina and Thomas suddenly find themselves in the middle of an exceedingly unusual criminal investigation that ends up forcing them outside the law.