The construction of a gigantic facility such as the Dukovany nuclear power plant requires only the most capable experts. Such is the engineer Hlaváč, who has been involved in the project from the very beginning as a construction manager. He has to deal with many problems, especially the lack of manpower. He is unfairly demoted to a lower position due to the intrigues of his subordinates and the alibi of the management, but time proves him right and by the time the plant is inaugurated, he is once again the main manager. But the demanding job takes its toll, his heart cannot withstand the frantic pace of work...