Creative Evolution

When I first penned down my first novel, I had a clear road map of what I was about to write and how everything was going to proceed. However, I was up for a surprise! As I wrote down the narration, I found that my characters started to evolve with each passing time and the situation I had presented to them in the book. Not only that but the situation itself needed an amendment for them to grow and expand. Even as a writer, it baffled me to observe this peculiarity. For example, the narration was decided to be only restricted to a few characters in the book. But for me to write and convey a proper story, I did (and that too badly) needed a point of narration from other characters as well. An