SunnyG asked Stuart Gibbs:

I love your books but I was wondering how many fun jungle books will you make in total, also how many spy school books will you make? Will there be a Charlie Thorne 4? 5?

Stuart Gibbs I don't know how many books will be in any of my series. But there will definitely be a Charlie Thorne 4.

I was just re-watching Scooby Doo: Mystery Incorporated, and just realized that the mystery man who is behind all of the mysteries of the show is called "Mr. E." That is the same name of the woman who is behind SPYDER, "Ms. E." of your Spy School books. Is that a coincidence? I think so, and is that a common nickname or name for mysterious evil leaders?

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