During a routine search of an old cabin in the remote and wintry backcountry, Finnish policewoman Nina Kautsalo discovers two dead prostitutes, with a third still fighting for her life. The ensuing investigation takes a surprising twist when an extremely rare and deadly virus is found in the surviving woman’s bloodwork. When the Finnish Bureau of Investigation takes over the case, German virologist Thomas Lorenz is called in to help identify and contain the virus. Set against the endless white expanse of the Arctic Circle, Nina and Thomas must rely on each other to have any hope of saving their loved ones. But what takes precedence? A deadly virus or an active serial killer?
