Lives will be lost, love sacrificed, and the whole world changed in the sixth and last instalment of the internationally bestselling The Mortal Instruments series. Erchomai, Sebastian had said. I am coming. Darkness returns to the Shadowhunter world. As their society falls apart around them, Clary, Jace, Simon and their friends must band together to fight the greatest evil the Nephilim have ever faced: Clary's own brother. Nothing in this world can defeat him - must they journey to another world to find the chance?