The blue flame

It was her 16th birthday and life as she knew it was about to change. Her name was Sam Mc Doyle and her family had a secret.
They are the guardians of the blue flame. A fire that if it went out the under world would break free and take over our human world. She had being training for it for as long as she can remember. She knew when the time came she would have to become the next guardian and today was the day. The day she turned 16. But you see the problem is that a prophecy states that she would either save the world or she would destroy it .