 The start of his run introduces Angie <unk> , a fellow magician , and <unk> his niece , Gemma Constantine , who has also fallen into magic use , to her uncle 's consternation . After <unk> his sister 's house of an evil spirit , and finding out Gemma has gone missing , John returns to London , to find his old colleagues and enemies are all taking sides in the hunt for a mythical item , known as the Red <unk> . John eventually locates the item , and finds Gemma , freeing her from his old enemy Josh Wright . Following several <unk> , Constantine then travels the world to set up a plan for a forthcoming tragedy , which will occur when " Three doors are opened " , involving Swamp Thing and the Garden of Eden amongst others . 
