Our days. A former Russian citizen was brutally murdered in France. The French authorities suspect that the case was not without the so-called Russian mafia and want to involve a specialist from the Russian Investigative Committee in the investigation. Senior investigator of the Investigative Committee Orest Volin goes on a business trip to France, taking with him another portion of Zagorsky’s diaries. 1890. The heir to the Russian throne, Nikolai Alexandrovich Romanov, sets off on a great eastern journey. According to the plan, he must visit a number of countries: Greece, India, Egypt, Ceylon, Singapore, Java, Siam. The last in the series will be China and Japan. In February 1891, Privy Councilor S., patron of Nestor Vasilyevich Zagorsky, informs Zagorsky that perhaps the heir may be in danger in Japan. It is possible that there will be an attempt on his life. Therefore, he asks Zagorsky to go to Japan and guard the crown prince. Zagorsky, however, suggests that the attack could happen earlier, in China. Therefore, we must have time to get to Hong Kong before the Tsarevich appears there. However, they only have a month left. How to get to Hong Kong from St. Petersburg in a month, considering that the Trans-Siberian Railway is still in the planning stages? The matter seems almost impossible, but not for Nestor Vasilyevich...