The action takes place in 1762 in the Russian Empire. A palace coup takes place, during which Catherine the Second is forced to take on the obligation of returning the throne to the heir, Paul, when he turns 18. Many people are eager to obtain such a tool of influence over the state. The Vatican wants the famous European adventurer Giacomo Casanova to be involved in the matter. The authorities believe that in this way he will be able to atone for his numerous sins...