Working on the 6th book in my series. Ensemble stories. Really trying to plan more. Used a spread sheet. Color coded for various threads, tagged for others. Able to highlight various tags. 85 chapters planned. Over 11,000 words in the "synopsis" of the various cells. Estimated length of the story, 195,500 words. Decided I had done all the planning I could stand and had to start writing and... wrote an entirely unplanned first chapter. It just had to be.
Dang it! I generally know how the book is going to end, and that tends to hold. But, when I put myself into the moment of "what's next?", the characters and the story often demand something different than I planned. Sigh.
Does this happen to others?