The Age of Darkness is descending upon the Grimm Universe! All hell is about to break loose as the Dark Queen prepares to wage war on Earth and the four realms of power all at once. Can Sela, Robyn, Cross, Shang and the rest of the Realm Knights stop her in time or will the Queen finally get what she wants: Power over all things. Volume 4 of the epic Age of Darkness series is here!