In a fictional future totalitarian society ruled as a one-party state. A teacher commits the crime to teach their students to think independently and is therefore being stalked. The fictional Monismania also appeared in Astrid Lindgren's saga about the witch Pomperipossa in the Monismanian 1976.
| Actor | Role |
|---|---|
 Erland JosephsonTeacher | Teacher |
 Harriet AnderssonTeachers wife | Teachers wife |
 Holger LöwenadlerClerk | Clerk |
 Ingrid ThulinPager | Pager |
 Margaretha KrookProsecutor | Prosecutor |
 Julia Hede-WilkensTeachers daughter | Teachers daughter |
 Gösta CederlundCaretaker | Caretaker |
 Tomas BolmePoliceman | Policeman |
 Ulf BrunnbergTingssekreterare | Tingssekreterare |
 Elsa Ebbesen-ThornbladJuror | Juror |
| KKurt EmkePersonundersökarens assistent | Personundersökarens assistent |
 Georg FunkquistJudge | Judge |
 Mathias HenriksonFd pastorsadjunkt | Fd pastorsadjunkt |
| EEva LevénJuror | Juror |
| CCharlie NykvistJuror | Juror |
 Lars WiikSoldier | Soldier |
 Birger ÅsanderJuror | Juror |