Author: Cassandra Clare
Shadows descended on the Shadowhunter world. Chaos and destruction rule the Nefelins. Clary, Jace, Simon and their friends face the most terrifying expression of Evil they've ever had to fight: Clary's brother Sebastian Morgenstern is on the attack and turns Shadowhunter against Shadowhunter systematically. With the help of the Infernal Cup, he transforms Nephelins into creatures out of a nightmare, tearing families and lovers apart as he swells the ranks of his Shadowed Ones.
When one of the greatest betrayals in Shadowhunter history is unmasked, Clary, Jace, Isabelle, Simon and Alec are forced to flee into the heart of the demonic realms, where no Shadowhunter has ever been and where no human has ever returned. .