Lou-ann' Couteau
Lou-ann' Couteau asked Rick Riordan:

Did you ever had this turning point in any book of yours where you changed totally what was supposed to happen ? Consequently there could be a totally different end to the story that we all know. Are even a totally different story ? Is here a huge what if? in one of your books ?

Rick Riordan It's an interesting question, but no, I can't think of any book I've written that has a drastically different ending than the one I originally anticipated. That happened to some extent in my earliest books (adult mysteries) when I was still learning the best way (for me) to plot, but since then I know the general outline pretty far in advance. Details change all the time, but not the overall story.
Rick Riordan
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