Maybe lots of series have multiple authors but long established series by a single author do not need extending by publishing houses who are just trying to make money on the back of the name. If the author is good enough they should be able to write their own series and if necessary claim it in the style of, or a tribute to the original. But it is never going to be a genuine continuation of a series, no matter how great, despite any thing the marketeers say. The same goes for writing "new" James Bond books.
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