Spring of 1889. After the death of his teacher Pavel Afanasyevich Blagovo, Aleksei Lykov goes on an assignment. In Japan, the corpses of three escaped Russian convicts are found—according to the documents, they still remain incarcerated in Sakhalin prisons. There are suspicions that their escape was organized by the Japanese mafia—the Yakuza. To find answers to all questions, Lykov heads to Sakhalin on a secret mission…