The Shadow City — Dan Jolley

Five elements. Two worlds. One city…and one chance to save it.

In the past two weeks, Gabe Conway has fought a six-winged dragon, bound himself to the element of fire, and rescued one of his best friends from the twisted parallel dimension known as Arcadia. Now he has to find a way to do something even more impossible: destroy Arcadia forever -- before a sinister cult unleashes its nightmare of death and destruction across San Francisco.