After the end of the Russo-Japanese War, relations between the two countries continue to remain tense. Japan is preparing a campaign against Russia, and in order to prevent new seizures in the Far East, Russian special services are conducting a top-secret operation. However, the disappearance of the Japanese heir confuses all the cards and puts the result of the operation in jeopardy. The boy's traces are lost on Sakhalin, a penal island inhabited by thieves, murderers and traitors. Such a concentration of crime and vice in one place can hardly be seen anywhere else in all of Russia. Almost anyone here could kidnap a child. But for what purpose?.. It’s up to the born detective and adventurer Georgy Rodin to figure out this complicated matter of national scale.