The October Page Turners book for discussion was Necropolis (Book four of The Power of Five), by Anthony Horowitz. It's unashamedly YA (or younger) and targeted at boys. This is a relief, because if it were an adult novel with women as an intended audience, it failed dismally!
For my part, I found it a trifle dull. The characters were not that engaging, and the action not that exciting. Moreover, the YA writing style, which over-explained everything, as well as the omniscient point of view irritated me excessively.
I don't believe anyone in our reading group was particularly enthralled by it, and about the most interesting discussion topic was the difference between this, which clearly doesn't translate well for the adult reader, and other YA novels (such as Harry Potter, for example -- but there are many others), which do.