Jules Verne 
Michael Strogoff – Or, The Courier of the Czar [EPUB ebook] 

Michael Strogoff, a 30-year-old native of Omsk, , is a courier for Tsar Alexander II of Russia. The Tartar Khan, Feofar Khan, incites a rebellion and separates the Russion Far East from the mainland, severing telegraph lines. Rebels encircle Irkutsk, where the local governor, brother of the Tsar, is making a last stand. Strogoff is sent to Irkutsk to warn the governor about the traitor Ivan Ogareff. Ogareff, a former colonel, was once demoted and exiled and now seeks revenge against the royal family. He intends to destroy Irkutsk by setting fire to the huge oil storage tanks on the banks of the Angara River. On his way to Irkutsk, Strogoff meets Nadia Fedor, daughter of an exiled political prisoner, Basil Fedor, who has been granted permission to join her father at his exile in Irkutsk, the eng war correspondent Harry Blount of the Daily Telegraph and Alcide Jolivet, a Frenchman reporting for his ‘cousin Madeleine’. Blount and Jolivet tend to follow the same route as Michael, separating and meeting again all the way through Siberia. He is supposed to travel under a false identity, but he is discovered by the Tartars when he meets his mother in their home city of Omsk. Michael, his mother and Nadia are eventually taken prisoner by the Tartar forces. Ivan Ogareff alleges that Michael is a spy… (Excerpt from Wikipedia)