Well, I'm currently working on a book, tell me what you think of the idea:
A girl from the future works for a company involving protecting the Earth from aliens, yet this girl is only 13, and keeping her secret from school is tough. When a meteor strikes the English Channel, it emits an orange poisonous gas containing eggs of giant carnivorous worms. It spreads across the entire planet, choking thousands to death. The girl must find a rare gem buried somewhere unknown to drive the worms away, and send the meteor back into space.
A girl from the future works for a company involving protecting the Earth from aliens, yet this girl is only 13, and keeping her secret from school is tough. When a meteor strikes the English Channel, it emits an orange poisonous gas containing eggs of giant carnivorous worms. It spreads across the entire planet, choking thousands to death. The girl must find a rare gem buried somewhere unknown to drive the worms away, and send the meteor back into space.