Everyone knows Harry Potter, yet no one has heard of his little sister, Lily-Kathryn Hazel Potter. Hagrid finds her in a room not far from Harry's and takes her to live with the Dursley's. They love her as a daughter due to her impeccable resemblance to Petunia's late sister Lily and the amount of guilt it causes Petunia to feel. She grows up in a loving home with an aunt and uncle who love her a cousin who is kind to her and a brother she adores above all else. Her life is perfect, that is, until mysterious letters start arriving addressed to her brother. He is whisked off to a land of magic, and begins to treat her differently. Will their relationship suffer due to his neglect? Will they ever recover? What happens when she herself receives a matching letter a year later? And what is that nagging black cloud that seems to take over her life?