Sissy Sour and the grubby knight

There was a time when Jeník Placka didn't like Sylva. As anyone who has read the book Sísa Kyselá will know. This sequel takes place after the ice of their animosity has thawed and Sylva is now Jeník's friend. They are both a year older, and Jeník even admires Sylva. However, two new classmates, who are quite keen on winning the girl's affection, start to interfere with their promising friendship. And so, Jeník has a lot of worries and work on his hands again. And who is this scruffy knight? You've probably already guessed…