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The continuation of the popular series of adventure and educational fantasy from Rafal Kosik «Felix, Net and Nika».

The book's protagonists are ordinary Warsaw teenagers Felix Polonius, Nat Biletsky and Nika Mickiewicz. The school is implementing an experimental programme of linguistic correctness, and from now on, every student must wear a DMI - a detector of linguistic otherness - on their clothes. Deviations from the detector's norms are fraught with trouble.

In addition to the stupid restrictions, tomboy Marcel, who is repeating the same class for the second year, is running for school board elections. His classmates can't let this happen to their school!

The trio of friends is also in trouble with one of the newcomers, Herald, who becomes a serious threat to their friendship. But all this is nothing compared to the fact that Nika has nightmares that begin to come true in reality!

Felix and Nat will have to investigate the problem in detail to help their friend. But will they be able to save Nika and their friendship?