You get a certain texture from a book written as a series of letters from one character to another. First, you get a strong sense of the character and how she perceives herself. Secondly, you get only her side of the story.
It’s hard to capture that sense of character on film unless you use voice over, and sometimes that seems lazy or intrusive. Still, something – anything – could have been done about We Need To Talk About Kevin, a film which reveals none of the nuance of its somewhat delicate subject matter and source material; a film which renders what was a true product of its time into a timeless jumble that veers between finely acted and merely over the top unpleasant.