22) Expiration Date, by Tim Powers

I think this is one of the few Powers novels I hadn't yet read. I enjoyed it. Set in California at Halloween 1992, it features the ghost of Thomas Alva Edison being pursued by various unsavoury people and entities. Powers conveys a real sense of the place and time - lots of references to the Clinton / Bush election campaign, and gritty portrayals of the people and localities of the greater LA area. Great fun.