Point Blank by Anthony Horowitz

Paperback-Book 1 in the Alex Rider series 

Meet the orphan turned teen superspy who's saving the world one mission at a time—from #1 New York Times bestselling author!
 
They said his uncle Ian died in a car accident. But Alex Rider knows that’s a lie, and the bullet holes in the windshield prove it. Yet he never suspected the truth: his uncle was really a spy for Britain’s top secret intelligence agency. And now Alex has been recruited to find his uncle’s killers . . .