Set in 1882, Russian author Akunin's fourth novel to feature Erast Petrovich Fandorin (after 2005's The Turkish Gambit
) consists of two parts that read like different books. In part one, the 26-year-old special agent comes to Moscow to investigate the sudden demise of national hero Gen. Mikhail Sobolev, who dies in the bed of an alluring courtesan. Fandorin learns of Sobolev's plan for a coup and of a missing suitcase full of a million rubles to fund it. The trail of the missing suitcase leads to the dangerous Khitrovka slums and then to Pyotr Khurtinsky, the scheming head of the secret section of the governor-general's chancellery. One step ahead of Fandorin is the mysterious Klonov, an assassin who may have once tried to kill our hero. As Fandorin closes in on Klonov, the narrative jumps to a retelling of the assassin's life. This shift brings a welcome change of storytelling, from the often stiff, theatrical language of the first section to a more natural, unembellished style. An exciting resolution only partly offsets this incongruity. (Apr.)