The Demons of St. Petersburg (movie, 2008)

St. Petersburg, 1860. A member of the imperial family is assassinated. A few days later, the writer Fëdor Michajlovic Dostoevskij meets with Gusiev, a young man committed to a psychiatric hospital. Gusiev confesses that he took part in the terrorist plot and reveals that his fellow conspirators are planning to kill another of the Tsar’s relatives. The young man also gives Dostoevsky the address of Alexandra, their leader. The writer must find her and convince her to call off the new assassination attempt.