In this dazzling and long-awaited conclusion to the acclaimed Mortal Instruments series, Clary and her friends fight the greatest evil they have ever faced: Clary's own brother.

Sebastian Morgenstern is on the move, systematically turning Shadowhunter against Shadowhunter. Bearing the Infernal Cup, he transforms Shadowhunters into creatures out of nightmare, tearing apart families and lovers as the ranks of his Endarkened army swell.

The embattled Shadowhunters withdraw to Idris - but not even the famed demon towers of Alicante can keep Sebastian at bay. And with the Nephilim trapped in Idris, who will guard the world against demons?

When one of the greatest betrayals the Nephilim have ever known is revealed, Clary, Jace, Isabelle, Simon, and Alec must flee - even if their journey takes them deep into the demon realms, where no Shadowhunter has set foot before, and from which no human being has ever returned...

Love will be sacrificed and lives lost in the terrible battle for the fate of the word in the thrilling final installment of the classic urban fantasy series The Mortal Instruments!

Cassandra Clare was born overseas and spent her early years traveling around the world with her family and several trunks of fantasy books. Cassandra worked for several years as an entertainment journalist for the Hollywood Reporter before turning her attention to fiction. She is the author of City of Bones, the first book in the Mortal Instruments trilogy and a New York Times bestseller. Cassandra lives with her fiance and their two cats in Massachusetts.