Good story idea? And any ideas for a title?

Plot: A 17 año old, baloncesto mad, girl who has lousy friends who are always bullying her and a crappy boyfriend falls in amor with her boyfriend's cousin from Australia.
She finds out her boyfriend was cheating on her with her best friend and so she dumps him, happy that she can go out with his cousin now if she wants to.
But the cousin has a secret. His twin brother is a serious schizophrenic and he and his family had to mover all around Australia because his twin kept hurting people and communities. Everywhere they went the communities turned on them and literaly threw them out.
Finally he confides in the girl, who looks past all that and the two fall in love.
But the twin doesn't like this. He resents the girl. He poses as his identical twin and lures the girl to an isolated farm where he keeps her hostage.
I haven't quite decided on an ending yet, a few possibilities....What do tu think? Could it be a good story with the proper escritura techniques?
Any ideas for a title? Thanks. ;)