Ineke Houtman

To save his family's hotel, a 13-year-old boy has to explore the minds of the strangest creatures on earth - his sisters.

After his father is hospitalized, Kos (13) has to manage the family hotel with the 'help' of his three sisters. He tries to take charge, but working with his sisters proves to be absolutely impossible. He doesn't understand the way their minds work at all. And he doesn't know how to act around the girl he has a crush on either. Luckily, Kos will soon learn invaluable lessons about these mysterious beings called... girls.