Malte loves numbers. He was the only one at school to qualify for the state competition and is now preparing enthusiastically for the Mathematical Olympiad. But suddenly, nothing is the same at home – his safe, carefully arranged world is shaken when his seventeen-year-old half-sister Josefine, whom he barely knows, moves in with them for a few weeks. Challenges also arise at school: Malte is joined in his preparations for the competition by Lale, who soon turns out to be not only »pretty as an eight«, but also a serious competitor. But all this becomes unimportant when Malte begins to discover a carefully concealed family secret… (summarized from the main page of Založbe Sodobnost)