Six-month campaign of the 2nd Pacific Squadron under the command of Vice Admiral Z.P. Rozhestvensky from European waters to the Far East was one of the glorious and heroic events of the Russo-Japanese War of 1904-1905, and its protection became the largest, longest and most expensive Russian counterintelligence operation of these years. However, military historians, as well as specialists in the history of Russian military, military-political and foreign intelligence, rarely and reluctantly recall the unprecedented campaign of the Pacific squadron and, especially, the efforts to protect it. Book by historian D.B. Pavlova talks in detail, based on many archival documents, about this heroic episode in the history of the Russian fleet.