The name of former GRU intelligence officer Vladimir Rezun, acting under the odious pseudonym Viktor Suvorov, became notorious after the publication of the book “Aquarium.” What prompted our intelligence officer to betray the Motherland? What secrets did he hide not only from his fellow students at the Suvorov Military School, but also from his family?...The author of the book, professional intelligence officer Alexander Kadetov, relied on rich personal experience, as well as materials received from former employees of the GRU, SVR, FSB and graduates of Suvorov schools, puts forward his version of the reasons for V. Rezun’s treason to the Motherland. This edition of the book has been significantly supplemented by the author with new, previously unknown materials about the life of the famous traitor, which will be of interest not only to employees of the special services, but also to a wide range of readers.