[KS] Are you the author, proofreader, publisher, retailer and website designer? If so, to be honest, I don't think you're doing any of those 5 things very well. I just skimmed through the opening pages of Ace's Adventures and, apart from the black dog scenario being rather old hat (and unsound
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if everything was pure black, even in daylight, the dog would not show up against a black background), the introduction page has at least two errors: comma instead of period at end of first paragraph; "answer" instead of "answered" in paragraph 3. I'd also prefer "different from" to "different than", but I'm English and picky.
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.