Many twists in the story

In the book, the individual turns of the story, quietly indicated by the narrative in the first person form of the two protagonists.
In the film, these twists and breaks come suddenly and unexpectedly. Therefore, here the voltage is higher than is the case in the book.
Grandiose as Amy her murder, by her husband pretends to itself to become the murderer later.
The final Inzinierung a harmonious couple, lets the viewer open many interpretations.