Actually in the photo I linked to above that's Dujon on the left, me wallaby in the middle and PaulWay dressed in a rather fetching shade of blue in the background (sorry about the poor light, you might not have seen him properly). I have met many people in the Morniverse, but not Rosie (or Dan or Dunx).
Even with my love of sub-clauses and punctuation, "With this book, you, too, can be a mystery solver!" just seems too much - especially for a back cover that is supposed to grab people's attention.
Sorry to sound harsh, but my suggestion is that you should send your two books to professional publishers, with an open and optimistic mind. Take on board their comments, because they really do know what sells, and how to sell it.