The novel “The Tsar's Kopek” continues a new historical series, inviting readers into the wonderful world of the writer Valery Voronin, who once said about his work: “Once I opened another door...” Research that would be more correctly called research related to secrets Crimea, they lead the main character - the writer Kirill Rudansky - to a real discovery: in Balaklava he finds ancient scrolls, which he identified as the legendary Pigeon Book. It soon became clear that the deciphering of the scrolls was somehow connected with the legend of the “appearance of two suns”, about future cardinal changes in the fate of our civilization. As the storylines were “built”, Kirill wrote books, which eventually “grew” into a whole historical series, which he called “The Pigeon Book”. A new round of discoveries is connected with the history of the Yusupov Castle, with the mysterious Sharide, who had the gift of clairvoyance , and the Tower of Jupiter, at the foot of which Kirill and his friends find unique artifacts.