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

Holidays are a serious business. Even when they look like an ordinary trip to the sea. Because for Felix, Net and Nika, these holidays have become unusual. Several times, the friends stood at the edge of the abyss, avoiding the TMK - a theoretically possible disaster - and defending themselves against it. In addition, they were convinced that the impossible time machine actually exists.