A submarine, built according to drawings from the future and controlled by a man who returned from this future and went through the horrors of three wars, including the Battle of the Atlantic, turns out to be a real “miracle weapon” in capable hands. Appearing out of nowhere, the formidable submarine delivers a sudden, devastating blow and again disappears without a trace. Mikhail Korf, having overcome the abyss of time, manages to change the course of the Russo-Japanese War at sea, turning it in favor of Russia. And this immediately causes fierce resistance throughout the world. Nobody needs a strong Russia. It will be much better for everyone if it turns into a raw materials appendage of “enlightened” Europe. The first period of the war, when Mikhail Korf managed to use his previous knowledge of the operational situation, is over. History has already changed dramatically. But the Japanese fleet, although it suffered heavy losses, continues to remain a dangerous adversary.