I imagine it's a fine balancing act. On one hand you don't want to rehash everything for someone who has read the 1st book, but on the other hand you don't want to have someone who hasn't read book 1 get lost. One thing I would think you could do is have some of the characters remember something, some event, that occurred in the 1st book. Something to help set the stage for the new book and refresh details for someone who read book 1 already without a long monologue. I'd guess that a lot of writers who write sequels and/or trilogies do some outlining of how events in the books link up as well.
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