Engineer Jan Ondrák (Radoslav Brzobohatý) is a hard-working and tenacious man. His work means everything to him and he devotes all his time to it. His colleagues respect him as an expert but they don't really like him because of his strict and uncompromising ways. Ondrák also teaches at the faculty, where his reputation is the same as at the factory. One evening, he meets some friends of his son Petr (David Prachar) and suddenly becomes aware of the enormous barrier that has grown up between him and the young generation.