Having read Falling Towers about a month ago I can't help but compare the two. Nine, Ten: A September 11th story fell very flat for me. I got a bit emotional reading Falling Towers. This one was a bit boring, the only emotions I really felt was reading the author's own experiences and why she wrote the book.
Four different characters, four different locations. All affected by one day that many remember in our time period 9/11. Starting off on September 9th we learn these characters stories and what they were doing up to the point of the planes crashing into the World Trade Center.
The actual 9/11 part in this book was really only a few pages, for me, I think that was a big downfall for this plot.
This isn't a happy topic to read about (especially since I am old enough to remember this day) but I think books like these are important to share to children who won't know of this event except for by textbooks or reading. If I had to choose one for them to read, it'd be Falling Towers.