The Dark Dragon (The Arkham Monster Book 1)

Melani Roseson is far from being normal. She doesn't even know that she's the evil monster that rampages in Gotham City at night, known by the Gotham people as the Dark Dragon. When she learns what she does at night, she runs away so she won't be confronted by Batman. Her running away leads her to a place known as Arkham Asylum. The people there seem to know Melani's problems so maybe joining them might link the key to her destiny.