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Hi, Dawsongrod,
A murder mystery should end with the revelation of who did the murder and, probably, why. That should be revealed gradually in the story, and is not just a statement at the end. Unraveling the mystery is what a mystery book is all about. And yes, you can use names like Shake Shack and McDonald’s, but it’s always safer to make something up.
Good luck! —–Gordon Korman—–