A car abandoned by the roadside, slowly disappearing from view as a heavy snow continues to fall. Inside the vehicle waits the answer to a complex murder mystery still waiting to be solved. William Wisting is contacted by the leader of an online group dedicated to solving a murder case together: the death of the Australian backpacker Ruby Thompson. One of the more active members of the group, Astria, claims to hail from Norway. But just as Astria announced to the others that she’s getting close to solving the mystery, she went offline, and no one in the group has heard from her since. Wisting is reluctantly fascinated by the unorthodox investigation. Soon he finds himself knee-deep in a case where the connections and leads are many, but their natures uncertain.