Full Moon: Story Idea

Hello;
I saw the trailer for Eclipse (the 3rd Twilight movie) on TV && I got this really good idea to do a story about Riley Biers, the new charecter in the story.
It would be about this girl named Rayn (pronounced Rain) Biers && how Riley is her brother && how he went missing.
It would make alot of sense if you saw the Eclipse Trailer; the link is here: http://www.youtube.com/watch?v=cJX4jIM3TOc

So comment if you think it would be an interesting story. Either way, I still probably do it... depends.