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The continuation of the popular series of adventure and educational fantasy by Rafał Kosik, Felix, Net, and Nika. The book's protagonists are ordinary Warsaw teenagers Felix Polonius, Nat Biletsky, and Nika Mickiewicz.

The Halloween holiday for Felix, Net and Nika begins with a dangerous game with the mysterious Grim Reaper. They try to ignore his messages, but the course of events directly affects their families, and they become involved in a strange mystical game.

The friends have to go down into the dungeons of Warsaw, find the monster Basilisk and travel to an abandoned construction set. Only the legendary treasure can help, but any attempt to find it only makes the situation worse. The most dangerous challenges lie ahead for the friends, as they will have to deal with the consequences of the problems that have fallen on their families.

The books about the adventures of friends Feliks, Net and Nika have become bestsellers not only in Poland but also far beyond its borders. In addition to Ukrainian, they have already been translated into Lithuanian, Hungarian and Czech. Critics call this series the "Polish Harry Potter". The second book in the series, Felix, Nat and Nika and the Theoretical Catastrophe, was made into a film, which premiered on 28 September 2012.

Rafał Kosik is a Polish science fiction writer. He has written more than 10 novels and the Felix, Net i Nika series of science fiction adventure novels for teenagers (14 books). In 2008, his novel Kameleon won the Janusz A. Zajdel Award and the Jerzy Żuławski Award.