Near a large Bulgarian city begins the construction of a large factory. There is a fertile land in close by. Prof. Dimov, Director of the Environment Protection Institute has to submit his official approval for the civil works to begin. He and his co-worker Prof. Radev refuse. Their decision meets the resistance of the administrative director Dragiev. With intrigues and treats he makes the atmosphere around Radev unbearable. This along with the struggles of Dragiev for the Director's position upset Radev. Radev leaves the institute and his home without notifying anyone. The restoration of the truth is to come. The young scientist Balchev will find strength in himself to defend it. Hopefully it is not to late because Prof. Radev suffers a heart attack.