Far from the "terrifying" collection that the back cover proclaims it to be, this is an uneven batch of tales, some creepier than others. While a few of these stories are genuinely chilling (The Caretakers, The Blood Line, The Beach Hut), most are a touch watered-down, perhaps in an attempt to make them more suitable for children (it is recommended for ages 9-12). A not-so-creepy ghost story misses the point, and a great author realizes that gore and psychologically scarring details (both of which, I agree, would probably not be the most appropriate content for a 9-year-old) are not necessary to a satisfyingly scary tale.
As an 11-year-old, I was exploring the classic gothic horror of Poe, the tensely scary stories collected by Hitchcock, the campfire-ready tales of "Boogers, Witches, and Haints" from Foxfire 2, and a plethora of slumber-party variations on the Hook Man. Kids who want scary stories can handle scary stories. Unfortunately, most of these probably won't fill the bill.
My own almost-11-year-old son passed this book on to me with the caveat that some of the stories were much better than others. As he indicated, it's worth reading for the gems. I'll have to repay the favor by introducing him to Alfred Hitchcock's Stories That Go Bump in the Night.