Picking Topics for Books

One challenge for a novelist is coming up with ideas that generate ideas for future books. While we're writing one, we need to generate ideas for more -- it's a cycle of life of sorts. 

I read a few non-fiction books, looking for anything that jumps out at me. And if it interests me, there is a chance I can spin a story around it. After that I noodle the story, try to come up with new ideas,