This romantic story turns on a stirring infatuation that takes hold of three young people under the influence of Simon, a Prague student. After the study year, 18 year-old Julio returns to his parental home, a little chateau on the Otava river. There he converges with his childhood friend Petr and the young boatman's daughter Klárka. Sharing her beguilement with Simon, who has quickly turned a tranquil summer atmosphere into a relationship drama, is Julio's cousin Rosa.

Václav Sova
as Julio

Otýlie Beníšková
as

Lída Baarová
as Rosa

Svatopluk Beneš
as Šimon

Antonie Nedošinská
as Paulina

Zorka Janů
as Červená Klárka

Josef Stadler
as Petr

Jaroslav Liška
as Střevlík

František Roland
as

Jan W. Speerger
as