Argentina, 1915. Accompanied by a doctor and his beautiful daughter, Köhner, a ruthless foreman who rules a yerba mate plantation with an iron fist, arrives in the city of Posadas with the purpose of hiring workers.
In a fort in the middle of the Pampa, their commander Hilario Castro decides to bring women from Buenos Aires, for deserting soldiers.
Leandro and Carancha inhabit the islands located in the Parana delta. When their son brings home a girlfriend, her presence makes Carancha jealous and dramatic consequences ensue.
