The film is a courtroom drama, told from the point of view of a madman. It is similar to a cross between
"Witness for the Prosecution" and a bad "Perry Mason" episode, the one where Perry might have cut off his finger just to make a point. Which is not to say that Krogstad's Idiot Savant is anything but brilliant, it is!
Idiot Savant seeks a point where the visual becomes inexpressible.
It is the cinema of brilliance where dramatic tragedy clashes with the style reminiscent of Jean Cocteau's "angelic" avant garde.