Basically that film is just about one long dialogue between the killer and his psychiatrist in a german prison (or psychiatric clinic?) in the 1920s or 1930s that spans over some days before the killer's death penalty. The other actors barely speak a word in this movie. That sounds rather dull but the compelling performance of the two main actors made me sit through the whole film. On the other hand, if you don't like dialogue movies the avoid. There's no action at all, only language and expressions... I'd give it a 7 out of 10..