The mystery of Alexander I, the Russian Tsar, revolves around his death in 1825 in the town of Taganrog. However, many questions remain regarding the cause of his death. The accounts from his physicians are contradictory, and the results of the autopsy are filled with uncertainties. Why did Alexander I choose such a harsh environment as his resting place? Why did Queen Elizabeth's diary go silent for eight days before the Tsar's death? These enigmas have sparked speculation about whether he truly retired in his middle age or faked his death.

Ten years after Alexander I's death, a refined elderly man suddenly appeared in the Ural Mountains, claiming to be Fyodor Kuzmich. He bore a striking resemblance to Alexander I and exhibited mannerisms similar to those of the Tsar. Some believe he is the true identity of the Tsar in retirement, while others suggest he could be the illegitimate son of Paul I or a guard officer named Uvalov. These theories only deepen the intrigue surrounding the mystery of Alexander I.