The mirage of imperial Petersburg, the luxury of Romanov's palaces... and the sad Petersburg of Dostoevsky, the wretched apartments of terrorists, where these bloody idealists prepared the future of the Motherland - these are the main settings of the book. Heroes of the story Emperor Alexander II - the last great tsar and the first Don Juan of Europe, pedantically who described in a secret diary five attempts on his own life and his last crazy love. And Prince V-ky is a descendant of a famous family, Rurikovich and... a secret agent of the secret police. Through his eyes we will see the rulers of the thoughts of the era - Dostoevsky and Herzen, Bakunin and Marx. And our famous young revolutionaries, who created the most powerful terrorist organization in Europe. And above all of them is the immortal Russian secret police, invisibly guiding the life of the country and entangling Russia with its network, in which the Empire ultimately suffocated. However, in the book there is a main winner, with looking at all these merciless political passions with a smile. This is the “science of tender passion” that ultimately defeated them all - the Don Juan Emperor, the unyielding terrorists, and the unfortunate handsome Prince V...