The events in the new novel by Andriy Kurkov and Yuriy Vynnychuk unfold in three plot sections: the Crusade of 1111, described in the Chronicle of the Knight Olgerd of Halych, the beginning of the Second World War in Lviv and Krakow, and the modern period. Who is the Virgin, and why has she been hunted for several centuries in a row, who is really the black archaeologist Oleg, and most importantly - where does the door lead, which can be opened with the keys of Mary? You will learn about this from the pages of one of the most anticipated novels of modern Ukrainian literature in recent years.