Cassandra Clare made her fiction debut with The Mortal Instruments series, which has been on many bestseller lists. Cassandra lives in an old Victorian house in western Massachusetts with her fiancÉ, their cats, and lots and lots of books. Visit her website at CassandraClare.com. Learn more about The Mortal Instruments series at MortalInstruments.com. Learn about her new trilogy The Infernal Devices at TheInfernalDevices.com.

To save her mother's life, Clary must travel to the City of Glass, the ancestral home of the Shadowhunters -- never mind that enter-ing the city without permission is against the Law, and breaking the Law could mean death. To make things worse, she learns that Jace does not want her there, and Simon has been thrown in prison by the Shadowhunters, who are deeply suspicious of a vampire who can withstand sunlight.As Clary uncovers more about her family's past, she finds an ally in mysterious Shadow-hunter Sebastian. With Valentine mustering the full force of his power to destroy all Shadow-hunters forever, their only chance to defeat him is to fight alongside their eternal enemies. But can Downworlders and Shadowhunters put aside their hatred to work together? While Jace realizes exactly how much he's willing to risk for Clary, can she harness her newfound powers to help save the Glass City -- whatever the cost?Love is a mortal sin and the secrets of the past prove deadly as Clary and Jace face down Valentine in the final installment of the "New York Times" bestselling trilogy The Mortal Instruments.