And again, the students of Professor Burago, Soviet officers Pavel Zhitkov and Alexander Naydenov, stand in the way of the fascist captain Vitema-Wolf and his treacherous associates. Their merciless battle for life and death is entering its final stage. And how could it be otherwise, since the discovery of an old scientist could bring a turning point in the development of military operations... The famous novel by the author of many Soviet bestsellers, which the whole country was reading half a century ago.