"This is the Zodiac speaking"

the long version

Kelleher and Van Nuys reconstruct the crime scenes, delve into the records, and psychoanalyze the Zodiac's letters to newspapers and the law enforcement agencies. The facts of the case and the fragmentary glimpses of the Zodiac's psychodynamics that came through his letters forced the authors, reluctantly, to draw a conclusion that is sure to be controversial-namely, that the Zodiac suffered from multiple personality disorder. They also debunk many popular legends and myths about the case, laying out the limited facts that we do have on the notorious Zodiac.