The buzzing sound you hear just might be Mosca, a counterfeit fly designed to deliver war germs while spying on the enemy. But Mosca escapes his trainers and devotes himself to killing off humanity so the rest of the beasts and insects can live. Mosca is very small, very smart and due to his designers blunder, very emotional. A tale of danger and suspense, crime and cruelty, fun and folly, this is the story of his flight and his pursuit, as one tiny fly takes on the world.