The fourth-graders of an ordinary secondary school were unbelievably lucky. Or unlucky—it depends how you look at it. Their teacher (and also the school principal) is a witch. No, she doesn’t fly on a broomstick or brew potions from bats, but she can send you to visit saber-toothed tigers or trolls, enchant a door, and show you what goes on inside a mobile phone. At first the fourth-graders are scared, and then they become scared and fascinated. Especially those of them who learned to do magic themselves.