Two men disappear at the same time, with one of them committing suicide using dynamite. The police try to figure out which one died and what happened to the other.
At their 25th high-school anniversary some bourgeois citizens remember their time in school as a happy one. In reality it was quite the contrary. The school was a madhouse in which the teachers, especially Blomme, tormented the students. As a result one of them became a murderer.