"My advice to aspiring writers of fantasy trilogies or series is that each book needs two main plots. There's the 'big story', the over-arching grand plot of the entire series, and there is the complete-in-itself, one-book plot."

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I tell aspiring writers that you have to find what you must write. When you find it, you will know, because the subject matter won’t let you go. It’s not enough to write simply because you think it would be neat to be published. You have to be compelled to write. If you’re not, nothing else that you do matters.

— Rick Riordan