Storm Breaker
Anthony Horowitz

The main setting of the book is Chelsea, England. Alex is dragged into spy business though, so he ends up in many different places. One is a SAS training camp at an undisclosed location. Another is the "bank" on Liverpool Street which is actually the MI6 headquarters. The next thing he knew, Alex was in Cornwall, England, at the home and operating plant of Herod Sayle. Cornwall is probably the most important setting in the book. It's right by the English Channel so that Alex can witness the incoming mysterious boxes that Sayle is having sent in. Sayle's plant is also right on top of the old Dozmary tin mine, which definately comes in handy later on.