GUILT. ATONEMENT. REVENGE. On a remote Swedish island, a little girl, Klara, grows up without a father. Now, twenty years later, she discovers a secret: a secret that powerful men will kill to keep hidden. On the other side of the world, an old spy hides from his past. He used to be the best agent in the field. These days the only thing he lives for is swimming in the local pool. Then, on Christmas eve, Klara is thrown into a terrifying chase across Europe. Only the Swimmer can save her. But time is running out...