The Genius Files #1 Mission Unstoppable. Interest Level… By Dan Gutman. And don't miss the next leg of the journey in The Genius Files: Never Say Genius! ... assassins as they try to come to terms with their being part of a top-secret government organization known as The Genius Files. As Coke and Pepsi dodge nefarious villains from the Pez museum in California all the way to the Infinity Room in Wisconsin, black-and-white photographs and maps put young readers right into the action. Coke and Pepsi McDonald didn't want to jump off a cliff. V. Genre. Genius Files Book List: The Genius Files book list, reading level information, appropriate reading age range, and additional book information. I really liked the combination of fantasy and non-fiction. Grade level: 5. It is even more exciting than the first book! review 1: More crazy adventures coming your way!Never Say Genius is the second book in The Genius Files series. They didn't want to get hit by poisoned darts from blowguns either. Fiction.