I agree with VydorScope. There will be clues on the cover that the book is part of a series usually and therefore there will be clues to the storyline from the previous book in the blurb. All you can do is try to limit things to small subplot facts or a broad scope. For example In "The Two Towers" Frodo and Samwise are on their own as the fellowship has broken, but you still have to read the book to find out how the break came to be (if you haven't already read the 1st book).
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