My Nightmare's are Another's Dreams

The story is about a young girl called Grace. She has been having nightmares but when she moves, she encounters a boy who has been having the same nightmares as her only his are dreams.
When they come together a series of events happen, all relating towards Grace's mysterious past.
What is Alex to her?
Why does she know what she does?
Why is she so special?

This is basically not happening, but i don't feel like deleting it so.... :P