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The one that has a number of other authors on it is the transition book from the first 10 “39 Clues” books to the next group. It’s called VESPERS RISING. I have a longish short story in there. It’s the bridge book between the first 10 39 Clues books and CAHILLS vs. VESPERS. It’s as much mine as anyone else’s, but not wholly mine. –G–