Latin teacher Birger Sjögren at Ringsala boarding school threatens his possesive and chronically ill mother that he will get married. She gets a stroke and dies. Sjögren is affected by feelings of guilt, envy and hatred towards the surroundings. A series of mysterious fires have taken place around the school the last few months. One of the students has seen Sjögren setting fire to a barn. But can he convince the trusted biology teacher Nordmark, expert of the criminal mind?
Edvin Adolphson
as Rolf Nordmark
Stig Järrel
as Birger Sjögren
Inga Tidblad
as Eva Sjögren
Hugo Björne
as Edvard Bergfelt
Linnéa Hillberg
as Magda Bergfelt
Hasse Ekman
as Per Sahlén
Agneta Lagerfeldt
as Anne-Marie Ström
Hilda Borgström
as Anna Charlotta Sjögren
Mimi Pollak
as Miss Danielsson
Bengt Ekerot
as Åke Kronström
Åke Claesson
as Dr Lundvall
David Erikson
as Andersson - School Janitor
