The Diamond Chariot — Boris Akunin

An Erast Fandorin Mystery. Russia, 1905. Russia is locked in a bloody war with Japan. As enemy spies converge on St. Petersburg, Fandorin is called to investigate an explosion on a railway bridge. Trailing a suspect to Moscow, the detective comes face to face with more adversaries than he's ever met with before. But can he prevent murder on the Trans-Siberian Express?