The history of returnees from France who returned to Poland after World War II. The action of the series covers the years 1946 - 1956. A group of Poles living in France - emigrants from the 1930s - undertake the drainage and development of lands in Żuławy Wiślane. The new settlers set up a company headed by their leader - Kazimierz Mikuła.

A group of thirteen years old boys and girls is investigating an event from WWII.