Krzysztof Grabień is a young orphaned son of a school teacher. He arrives at the seaside to look for a job in a newly built port of Gdynia. It is early 1923 and a lot of people from the whole Poland go there, hoping to achieve wealth and to take part in a new great national initiative that is building a new, major industrial centre at the Baltic Sea. Young Krzysztof does not know what to do and how to cope with the rapidly changing reality of the beginnings of the city of Gdynia.  Against the background of the youth loves and struggles, appears the work of engineers and thousands of people from all the levels of society. They are all united in the effort of building the city that has changed the political and economic situation of the Baltic Sea region in the 1920s.