EN
The aim of the study is to make a research in genealogic and structural relationship between a genre of fantasy and a detective story. The relationship of both two genres was demonstrated through series of the interpretations of the particular texts not following strictly a historical line, but rather logic of the structural transformations. Following it a typological classification was made. The types of the texts mutually differentially defined through logical relationships: inclusive relationship between fantasy (also horror) and detective story, reversed inclusion of fantasy to a genre of a detective story, exclusion between a detective story and horror and relationship of the unique synthesis between a detective story and a fantasy. Excluding supernatural forces from the detective story operate in economy of a superior regime of the rules of fair play of a detective story (equalities of chances for a reader as well as a detective, providing by pure rationalistic solution). If there is a distributed supernatural explanation in the text, which in its exposition (and etiquette on the cover) activates the detective story reader's generic expectations, pre-programmed detective story reader classifies it as a cheat, as a breaking of a genre pact of a reader with the text. The different genres construct their specific fictional worlds with not breakable rules - breaking of them produces an overlap into a text of a different genre.