Chronicles: Russia will feature the Russian assassin Nikolai Orelov in 1918, during the aftermath of the October Revolution. Orelov wants to leave with his family, but is required to perform one last mission for the Assassin Order: infiltrate the house where the czar's family is being held by the Bolsheviks and steal an artifact that has been fought over by Assassins and Templars for centuries. Along the way, he witnesses the massacre of the tsar's children, but manages to save the princess, Anastasia. He must escape the Templars while protecting the artifact and Anastasia.
Source: Wikipedia, "Assassin's Creed Chronicles", available under the CC-BY-SA License.