There was a tweet yesterday too Sylvia about book #4.  The person wondered if she wrote them one right after another.  She had said no because her other books had to be done.  Also the talk about it going to HBO, definitely makes me think this will definitely go beyond book 4.  I have a feeling there will definitely be more "enlightment" of his father in book 4.
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Someone who performs a ponzi scheme is narcistic (as someone else mentioned) and they are too into themselves who are sick.  I have personal experience being a sister of one (not Madoff) and it's a devastating experience when someone who you love and trust and loose money too does this.  I know though he would not commit suicide. He's in jail now for 40 years. Â