Kruk is summoned to work on a kidnapping case. An 11 year-old boy is missing. He has to put aside his private investigation on the molestation case. Thanks to his extraordinary perceptivity, he follows a lead to an old wooden house. There, somebody knocks him to the ground.
Following the arrest of the kidnapper, Kruk goes back to his case. We learn that Slawek committed suicide 30 years ago and is only a figment of Kruk's imagination, his biggest reproach, one that forced him to travel back to Bialystok.
Despite capturing the kidnapper, the Police are unable to locate the boy's whereabouts. Kruk leaves his investigation behind and decides to help the Police.
Thanks to the help of Kasia, a young policewoman, Kruk is on the verge of uncovering those responsible for hurting children in the orphanage, 30 years ago. Kruk, who is able to locate the kidnapped child, is brutally attacked by a stranger.
Kruk saves the kidnapped boy, but loses an important witness, who was to lead him to the paedophiles. When all hope seems lost, the kidnapped child kills his grandfather. Kruk discovers that the kidnapping and the murder are intertwined.
