Undesirable no. 2

Melody's life takes a drastic turn when she finds out that she is a witch who was hidden in the muggle world for 13 years. Growing up in a muggle orphanage is tricky, to say the least and that is without the witch knowledge. How is she supposed to understand all these wizard terminologies? She is entering Hogwarts for the first time as a fourth year with no parents and no idea why a murdering maniac is trying to kill her and her new friends......things can only get better right....? (Golden trio era)