Discovering the truth about her past was only the beginning, now Clary must save the world from her own father – the rogue Shadowhunter Valentine. With two of the Mortal Instruments at his command, Valentine is assembling an army of demons to wage war on the council of Shadowhunters and destroy them once and for all. As the battle begins, Clary must face her darkest fears – and come to terms with her feelings for a boy she wishes wasn’t her brother.