Lili has a secret - she can talk to animals. They all love her immensely. But it's worse with children. Lili prefers to avoid them. She is afraid that her classmates will think she is crazy, so she guards her secret very well. But then she meets the most wonderful and funniest boy in the whole school, whom all the girls are crazy about, and it turns out that he too is hiding something! Lukáš is above average intelligent, but he pretends to be a completely ordinary, average student so that others don't consider him a nerd. They will become true friends. When, during a visit to the zoo, they learn that they want to put the elephant Marta, who for some reason falls into fits of rage, to sleep forever, Lukáš explains to Lili that only she can help the elephant.