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I think I already answered this, Dawson, but here goes again: The book should consist of your hero/detective/cop’s effort to solve the murder mystery, and the very end should be successful, revealing whodunit, and maybe even why, and how it was discovered. It’s all part of the story and should build up to the end. As for brand names, I usually avoid them, just in case some burger place or ice cream shop gets insulted. It’s easy enough to make up a fictional one, right?
Good luck with your book, Dawson. —–Gordon Korman—–