Again, no chance to get a stab at it, so I'm going to ask the stumper this time:
  One of the co-authors of the infamous Doom novels also authored another demon-themed science-fiction novel that was part of another four-part set.  I'll give you the following hints:
  1)  It was the fourth and final novel in the series. 2)  It was the only novel in the series he authored. 3)  This 4 part series was part of a larger, popular science-fiction genre.
  What was the title of the book, the title of the series, and which Doom author wrote it? 
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