Rosa Falvi and the Magical Journey

Oh, here are some old acquaintances! The wizard Merlin the Great, who once was the most uncivilized magician in the world named Merdin the Wild, 12-year-old girl Rosa, and her talking guinea pig Bublik. Do you remember them from the... first part?
This time, Rosa is fully utilizing her magical abilities… Just like her impossible, annoying brother Chris, who needs magic only to entertain his friends. But as soon as Chris suddenly disappears and gets captured in the Middle Ages by terrible barbarians and an evil witch, Rosa suddenly realizes – her brother is very dear to her. Now the girl must embark on a journey to the distant past, find her ancestor Merdin, save Chris, and along the way, save the whole world!
A sincere and funny book about true friendship, caring for loved ones, staying true to oneself, and the importance of a pinch of magic in each of our lives.
For middle school-aged children.