Okay, suppose I write a sci-fi series about a Devonian boy named Kenthew Rennald and his human companions (Captn. Helen Chert of the USS Santarnica and Captn. Gordon Randolf of the HMS Forfus). During the series, they discover that Kenthew's homeplanet has been invaded by the Altrans and the people have been slaves for the next fifteen years. Kenthew, being rescued months before the initial invasion when he was a baby (He's now 15), decides to liberate his people. After huge battles, he, Helen, and Gordon are standing in the throne room with the former slaves kneeling down. They want a new ruler to help usher then into an age of healing and peace. I pause. If I were a reader, I'd be throwing the book away because I'd already know how it'd end...predictabley. Kenthew would most likely become the new ruler because Helen and Gordon would have to return to the Earth. I just feel like this plot is a wee bit predictable. Even if Kenthew didn't become the ruler, someone we know will. So, what do you do when you start suspecting that your story is becoming predictable? How do you know if your story is becoming predictable? What's the difference since you already know how it's going to end?