Clara has known she is part-angel since she turned fourteen two years ago. But only now, through fragmented visions of a terrifying bush fire, is her Purpose - the crucial rite of passage for every part-angel - becoming clear to her. When Clara meets Christian, the boy in her visions, he is everything she could wish for - so why does she also have feelings for her enigmatic classmate, Tucker? Clara discovers that her Purpose is only a small part of a titanic struggle between angels and their destructive counterparts, the Black Wings. And when the fire of her vision erupts and both Christian and Tucker are in danger, who will she choose to save?