Great war that later will be named First world rumbles above the European continent, mispronounces and changes the fates of millions of people. Among them and three brothers Ивановы, acquaintances to the reader on a novel "Enemy on a raid": lieutenant of fleet Vadim, airman Cyril and naval cadet Vasiliy. And to resist to the foreigners they have not only at the front, where all clear but also in an own rear - in a fight with the insidious agents of enemy.