The whole story is based on the sudden end of a seemingly solid, happy marriage. Olga, a stay at home mother in her late 30s, is told by her husband Mario that he is leaving her and their two children. Initially, Olga believes that Mario is not serious, but she soon realizes he has left her for another woman. The end to the marriage of 15 years creates a profound internal crisis for Olga. She has to work again and gets the job of finishing and translating an unfinished novel.
After discovering that the other woman Mario is having an affair with is the daughter of one of his colleagues, whom he met when she was fifteen, Olga begins to have a breakdown. She attacks Mario and his new girlfriend Carla when she meets them in the street. Afterwards, Olga begins a long introspective journey to analyze the years with her husband, to find errors and gaps that could have created his desire to leave. The sad reality soon emerges: Mario is simply in love with another woman.
Olga, therefore, completely abandons her sadness, risking losing herself and her life. Her responsibilities multiply against her: there are two children to care for, a house to maintain, and a dog to look after. Ordinary actions, the basic precautions of a mother, begin to alienate her and make it impossible to continue. Her past and her childhood fears return to torment her, together with the idea that a woman without love, without a man, can't survive. She grows vulgar in mind and gesture, as a relief from unbearable pain. Olga tries to seduce a neighbour, but it goes terribly. Though they attempt to have sex, they are eventually forced to give up when he cannot sustain an erection.
One day in August, Olga's son Gianni contracts a fever while her dog begins to be sick. She fears he is poisoned. Her younger daughter, Ilaria, can't understand her emotional state, just annoys her and is whiny. Otto, Olga's dog, starts to show signs of physical suffering from poisoning, like her son. Olga accidentally jams the key in the lock and realizes that she cannot call for help as her phone line is down and her cellphone is broken. Due to the summer holidays the apartment building she lives in is virtually empty. She finds herself completely unable to focus but eventually pulls out of it and, when her downstairs neighbor comes by to check on her, is able to open the door herself.
Olga's son is fine, though her dog dies. Through this situation, she comes to understand that she has the means and strength necessary to control her own life. Helped by her neighbour, Aldo Carrano, Olga resolves each problem and begins that day to fight to restore the pieces of herself, to care again for her son and daughter, and to recreate civil bonds with her now-ex-husband. She eventually rebuilds her life, arranging for joint custody with Mario. Though her friends try to set her up with men, she shies away from them. One of her friends invites her to a concert where she sees her downstairs neighbour playing in the orchestra. Realizing that perhaps she has misjudged him, she contacts him again and the two attempt a relationship.
