Congratulations, you finally got published! Now what? In almost every article I've read concerning first novels they always recommend writing it as a stand-alone story, but that doesn't mean the story has to end there. But here is my question: Let's say, hypothetically speaking, my first book was a physiological thriller where the main character is left in a coma and in the second book I plan to build a fantasy novel that's completely in the mind of the main character as he battles to free himself from the coma, or something like that. Is it frowned upon to have sequels change genres? Should I just write the second story as a stand-alone novel because of the genre difference and hope my author's name is enough to sell the next book or is using the characters in a different story (but still slightly related to the first novel) the better decision, because I know I have characters in the story that my audience already knows and loves? Just curious what other writers think, perhaps you can come up with an example of a book series that changes from a romance genre to an action adventure genre in the sequel or something drastically different from the original story.