Stormbreaker, The Novel 

Alex was just a normal teenager, until his uncle suddenly dies in a mysterious car crash. Then, against his will, MI6 drag him into the action packed world of spying. 

Alex encounters his first mission which is to gather information on what Sayle Enterprises are up to with the new Stormbreaker computers. But to do so, he must pose as Felix Lester, the boy who won a trip to see Herod Sayle and to have first go on the Stormbreaker. Alex eventually finds out that Sayle is putting computer viruses into the Stormbreakers, not to distroy the computers but to kill millions of innocent children.  Now he must use his skills and abilities to avoid being killed by the deadly assassin Yassen Gregorovich.