The events in the new novel by Andriy Kurkov and Yuri Vynnychuk unfold in the three plot dimensions - The Crusade of 1111 described in the Chronicle of the Knight Olgerd of Halych, the beginning of World War II in Lviv and Krakow, and the modern period. Who is the Virgin and why has she been searched for centuries, who is the black archaeologist Oleg, and most importantly where does the door opening with Mary's keys lead? All of that you will learn on the pages of one of the most anticipated novels of modern Ukrainian literature in recent years.