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Winter 1993. On the same day, in unclear circumstances, two teenage siblings die. The police classify both deaths as tragic, unrelated accidents.
Easter 2013. After seven years working at the Institute of Investigative Psychology in Huddersfield, Sasza Załuska returns to the Baltic coast. Paweł "Buli" Bławicki, the owner of a music club in Sopot, comes to see the profiler. He suspects that his business partner, a former singer and the author of the hit Dziewczyna z północy, wants to kill him. Załuska is to provide him with evidence. The profiler is reluctant to get involved in the case. But when a shooting takes place, she is forced to take up the challenge. It soon turns out that the murder at the club is linked to the events of 1993, and that the victim knew who was to blame for the siblings' deaths. One of the keys to solving the mystery may turn out to be a song from years ago.