This diploma thesis deals with the comparison of three literary works, namely Harry Potter series by Joanne Kathleen Rowling, The Secret of Platform 13 by Eva Ibbotson, Groosham Grange and Return to Groosham Grange: The Unholy Grail by Anthony Horowitz. The aim of the theoretical part is to outline the theory of fantasy and also the lives of the three above mentioned authors. The rites of passage and the Gothic tradition are also included in the first, theoretical, part. The aim of the interpretation is to compare the following themes occurring in the discussed works: the journey to the world of fantasy, the picture of the other world and the hero and his opposite. The summary attempts to prove that the discussed works have different messages. In particular, Rowling focuses on morality, Horowitz deals with farce and Ibbotson concentrates on humour.