Lara, just turned sixteen years and a past to forget, finds comfort in the friendship of Cristina, the librarian without children who lives with her husband in a farmhouse in the countryside Areggio. When one night the girl mysteriously disappears, the small provincial town, full of hypocritical respectability, points the finger at Cristina. Many people in fact to catch a glimpse of the woman in the relationship with the girl "difficult", a morbid and socially unacceptable ambiguity.

Since that time the librarian, alone against all, will begin his grueling search for the truth at any cost.