Ella and the Chickenpox Alarm! School used to be so much fun, but suddenly the teacher is sick: he actually believes he has the best job in the world. Normally, when someone is that ill, they are sent to the doctor, but students can't exactly send their teacher to the doctor - and that's when Timo, the class genius, has an idea: they send Pekka! He is supposed to pretend to have the same illness, and if the doctor prescribes something for him, it should also work for the teacher. But it seems the teacher is even sicker than Ella and her friends thought.