The Shadowhunter world faces darkness once again. Clary and the rest of the Nephilim have to fight her own brother in battle. Seemingly undefeatable, he is an enemy like no other. Can Clary, Jace, Simon and their friends defeat him, or will they be forced into another world to find a chance? Lives are at stake and love will be sacrificed, changing the entire world in this last installment to the series which has held readers around the world stuck to their seats for the past few years.