Kara is going on a school trip. She is looking forward to it. But Rose cries on the bus. Maybe she feels homesick? Kara wants to comfort her, but she forgets it because so much fun stuff is happening. And then, during the treasure hunt, Rose suddenly disappears ...

This is the ninth book in the popular series about Kara and her friends. The books are about friendships, school and getting older. It catches the audience exactly where they are. The books can be read independently of each other.

Line Kyed Knudsen (b. 1971) debuted as an author of children's books and books for YA in 2003. Since she has become one of the most popular authors for the age group in Denmark.