Christy Riddell's shadow. Those parts that he cast off from himself when he was seven years old. They are the parts of himself that don't seem acceptable and that don't fit in the world around him. His shadow is the opposite of him in many ways. She is bolder, wiser. She makes friends easily, is very open and cheerful. But she also has a quick temper, a recklessness. She is short, dark skinned and red haired. Met by Mumbo?, her guide and tutor, in the borderlands. Christy refers to her as Mystery. She tells his girlfriend Saskia that she calls herself Christiana Tree.