A revolution threatens to detach the Siberian provinces from Russia's influence. All forms of communication between Moscow and the rebel areas have been cut off. The brother of the tsar, who is in Irkutsk, is in immediate danger from the traitor Ivan Ogarev and must be urgently notified. Then the capable and clever Lieutenant Mikhail Strogoff undertakes an important mission: to deliver the tsar's letter to his brother. The dramatic events that mark the journey of the tsar's courier follow one another, and alongside the terrifying adventures and deadly dangers, a great love is born. The reader will accompany Mikhail Strogoff on his entire tragic journey, in one of Jules Verne's most human novels.