Reilly has a formula which works, as you fly through the latest adventures of Jack West Jr. and his quest to find the six stones in the title. I pretty much read the book in a couple of days, and while never really challenged to think I don't read Reilly for intellectual stimulation.
If you're looking for a good public transport read, then this will suit you fine.
While you're at it chack out Reilly's blog. He is a real geek, proudly owning a life size model of Han Solo in Carbonite, and a DeLorean the model of car from Back to the Future. I'll put the link in my Blogroll.