The following is syndicated from devorahfox.com and is posted here with permission. Cover links to Amazon.com The bookselling industry requires that publishers and authors categorize their books. That makes sense. Readers in search of something new to read usually know that they’re looking for a mystery, biography, cookbook, etc. They would not at all be pleased to find bookstores, be they brick-and-mortar or electronic, with no more organization than a rummage sale. While the industry has a clear understanding of the various genres , it’s not all that clear to me. For example, what would you say is the difference between a mystery and a thriller? (Some years ago I heard one author, I believe it was Margaret Maron, say the difference is a $700,000 advance.).