Stormbreaker by Anthony Horowitz

Synopsis from Barnes and Noble

They said his uncle Ian died in a car accident. Alex Rider knows that s a lie, and the bullet holes in his uncle s car confirm the truth. But nothing can prepare him for the news that the uncle he always thought he knew was really a spy for Britain s top-secret intelligence agency. Enlisted to find his uncle s killers and complete Ian s final mission, Alex suddenly finds himself caught in a deadly game of cat and mouse, with no way out. The original novel that started the worldwide phenomenon is now a major motion picture!

Here is the movie trailer...