I write whatever pops into my head. Not just concerning ideas for new books which I keep collected in notebooks, but during the writing process. I don't write storylines, but rather I will see how it ends up, being as much a surprise for me as it is for you. I also will stop at random points, go back and think of what I expect to happen next. Then I will either do the exact opposite or something totally different that no one saw coming. Also I hate when you read the back of a book and you are three quarters of the way done reading the book when you catch up to that point. Mine are not like that.