Modern trends have not bypassed the magical world of Zakrytka. The heroes of the book - students of the Lyceum of Witchcraft and Wizardry Denis Kotik and his friends - go to the magical Academy Magisterium of the distant northern country of Forest Nord to exchange experiences. But in the lives of our heroes there is always a place for feat. And therefore, instead of boring lectures and excursions around a foreign castle, the guys find a more interesting activity: they save the Magisterium by uncovering the conspiracy of the students of black magicians and destroying their secret society - the Brotherhood of the Sly.