Blessed Basil"s treasure

The temple of Basil Blessed is the true treasure of the architecture and scientific thought of Russian architecture of the 16th century. But few people know that a great secret is hidden in the walls of the cathedral, which only the chosen ones can be solved ... in the church of Basil Blessed right during the excursion, which is led by the guide Elena Sinitskaya, one of the visitors dies. He dies under strange circumstances next to the grave of St. Basil, and Lena gives the impression that he was looking for something there. And the next day it turns out that Professor Plotnikov was killed - the supervisor of Sinitskaya, who was just engaged in the study of the era of the reign of Ivan the Terrible and architecture of the 16th century. Before his death, the carpenters managed to write some cipher on a sheet of paper