Shadowhunters and demons square off for the sixth and final book in the internationally bestselling Mortal Instruments series from Cassandra Clare. Discover more secrets about the Shadowhunters as they fight to protect the world from demons in the final book in the internationally bestselling series. Darkness has descended on the Shadowhunter world. Clary, Jace, Simon, and their friends band together to fight the greatest evil they have ever faced...