*warning* It's a bit slow at first but it will get interesting soon. What if Harry had a twin sister but didn't know? What if his twin was saved only because of him? In this story this is exactly what happens. They meet on the train to Hogwarts in their first year and become best friends. They always felt that they had some connection but didn't know what that connection meant. Harry is always protective of her and also gets a bit jealous when she speaks to other guys. They find out that thier twins in their third year.

Within two years Caoimhe became invisible. After her mother passes away during her second year, life continues to get worse. With no other relatives left to turn to, she has to move in with her mysterious half-brother Colm. As she begins her fourth year at Hogwarts, Caoimhe assumes the coming year will be as horrible as the rest...until Harry Potter sits in her compartment on the train. Life begins looking better as she makes unexpected friendships and joins Dumbledore's Army. A year later she is asked to tutor the one and only Draco Malfoy, and begins an unlikely relationship. Along the way she discovers her mother's dark past and the secret to her father's identity.