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Crocodile Tears by Anthony Horowitz (Alex Rider Series, Book 8)
A charity broker con artist has raised millions of dollars in donations, only to invest them in a form of genetically modified corn that has the power to release an airborne strain of virus so powerful it can knock out an entire country in one windy day. A catastrophe so far-reaching that it would raise millions of dollars more in charitable donations, all of which would be embezzled by one man.
Alex Rider, of course, who survives gunfire, explosions, and hand-to-hand combat with mercenaries just another day in the life of an average kid.