Scorpia Rising by Anthony Horowitz (Alex Rider #9)

Alex Rider wants his life back. But when you're the world's most successful spy, there's only one way out. Alex's final mission will be the deadliest of all.

When the world's deadliest terrorist organization, Scorpia, stirs up trouble in the Middle East, it is up to fourteen-year-old MI6 agent Alex Rider to thwart their plans.
One bullet. One life.
The end starts here.