Re: What Fantasy/Sci-Fi book have you just finished? Please rate it...
_Gateways_ by F. Paul Wilson, part of the Repairman Jack series.
The only problem was that, due to having to read books in the series I can find, I read the next book in the series (Crisscross) before this one, which did spoil the metaplot a bit. However, even with that, I enjoyed the book greatly. The self-contained plot is good and the clues for the metaplot are nice (even having read Crisscross first, there are some things in Gateways that aren't referenced in Crisscross).
If you don't like Repairman jack, you probably haven't (and never will have) gotten this far into the series; if you've never read a Repairman Jack novel, start with The Tomb. Of the five RJ novels I've read so far, only Legacies seemed lacking a bit (but then it was more scifi than horror).