@Awkadorable Oh, as much as I would love to write a fourth book, it is my job so I don't think I'd be able to write it and post it without it getting published somewhere that provides royalties. It's an unfortunate reality of the business. Writing is an art, but publishing is a business and publishing is what pays my bills! :)
As for inspiration, I write the book that I want to read. More specifically, I find stories that intrigue me--in the news, in life, wherever--and ask myself what if this were real?