Yeah Godhevals advice is pretty sound If there are enough reliable sources to warrant a separate article go for it If there is only a little information about the series out there compiling it into a single article may be the best bet Its really up to what you think would look best generally if there are at least a couple of sources like reviews or news stories about the book then a separate article works best I know nothing beyond the series beyond the basics I work in a bookshop so I cant really give an opinion on this series specifically at the moment Id be happy to give my opinion onhelp improve an article if you write one