Russian from "Titanic"

In the spring of 1912, the private detective Yuri Rostovtsev, along with dozens of other subjects of the Russian Empire, climbed aboard the Titanic transatlantic liner, which is on the first flight, to New York. Going to this city on the case, Rostovtsev could not even think that the present business awaits him not in New York, but on board the Titanic ...
Who and why dealt with one of the Russian passengers? Why did the Liner team be a fighter-Eser-an old acquaintance of the detective? How is the famous Tunguska meteorite connected with everything that is happening? To find answers to these and other questions, Rostovtsev has exactly four days. Four days to save the Titanic. And to save the world