Gaj is a special fifteen-year-old. He is not talented at gymnastics, loves reading books and has never been in love. He lives in a seemingly happy family. Only sometimes is he a little sad. In order to better understand himself and unravel at least some of the secrets of this world, he starts writing a diary. It is full of adolescent awkwardness, funny breakdowns and the revelation of secrets, making the events as tense as in a detective story. The diary becomes Gaj's true friend, who can tell him that he was a victim of peer violence, that his friends are involved in their first love affairs and that his family is different. He can also confide in him unpleasant things. He bravely persists in seeking the truth, even if it means that the world, which was safe until then, collapses. Because when writing a diary, as Gaj says, one must be very honest, the most honest. (summarized from the general page of Založba Pivec)