The State Counsellor(2005)

Original title: Статский советник

A special train from St. Petersburg to Moscow. General Khrapov is stabbed in his compartment. A mysterious "BG" mark was found on the handle of the bloody blade - the sign of an elusive terrorist group. Only Fandorin can neutralize it. Prince Pozharsky, who is also investigating the case, stands in his way. A deadly duel begins.