Two sisters, Madeleine, still a child, and Sophie who is a teenager, are on vacation by the old grandmother in a country house in the province of Northern Italy.
The parents are separated. The father lives in the city and, because of his work, he shows up very little in the country house. The mother is in France, in a boat with her ​​new boyfriend.
One day grandmother feels bad. Nieces, worried, call a doctor, who, however, proves much more interested in Sophie than in the conditions of grandmother. Fearful for the fate of the old woman, the sisters go to town by their father to retrieve his duties as son and as parent.