Here comes "Ella at School" for beginner readers! School is really fun. On good days, even the teacher thinks so. Ella's teacher suddenly starts behaving very strangely. He used to always say smart things and reminded the class to be quiet when they were making noise. But now he constantly mixes up words and forgets to assign homework to the class. Could it be related to the mysterious letters that have recently been sitting on his desk? Ella and her friends are sure of one thing: the teacher is being blackmailed! Of course, they want to save him and quickly come up with a plan to catch the criminal.