Bestseller from the star of the Swedish detective!Christian Tudel's dream came true: his debut novel "Mermaid" was published with great success. But why is he depressed and withdrawn as never before? His friend Erika Falk found out that for some time now he began to receive strange frightening letters. Meanwhile, Magnus, Tudel's best friend, disappears without a trace, and a little later he was found dead and frozen in the ice on the coast. Erica's husband, Detective Patrick Hedström, takes on the investigation of this terrible case. He found out that three of Christian's closest friends, including Magnus, received the same threats. But the survivors flatly refuse to answer all questions. What caused their strange silence? And what secret do they keep so stubbornly, without fear for their own lives? We need to find a clue before it's too late...