The Romanov Prophecy

The Romanov Prophecy is 2004 a novel written by Steve Berry and is an amalgam of fact and fiction. The novel relates the adventures of Miles Lord, an African-American lawyer in post-communist Russia on finding the descendants of Grand Duchess Anastasia Nikolaevna of Russia and Tsarevich Alexei of Russia, who were thought to survive the massacre that took their family's lives.

After weak governments and the communist era, the Russian people voted to bring back the new tsar, who will be chosen among the closest relative of Nicholas II of Russia from the surviving Romanov clans. Miles Lord, the protagonist, is tasked to do a background check on the favourite contender to be tsar, Stefan Baklanov. After almost being killed in the center of Moscow, Lord starts to discover new facts and documents that could threaten Baklanov's aspirations. Based on the diary of Felix Yusupov and a prophecy of the famous Rasputin, Lord finds out that there could be a direct descendent of Alexis and Anastasia, children of Nicholas II, living somewhere in the world. In this novel, Lord travels to Moscow, St. Petersburg, Starodub, Vladivostok, Atlanta and San Francisco trying to find the inheritor of the Romanov family. If he has success, Russia will find the real tsar, if not, Stefan Baklanov will obtain power, and nobody knows what he will do with the country.

...
Wikipedia