The Mortal Instruments, the Complete Collection

City of Glass is the third book in the urban fantasy series The Mortal Instruments by Cassandra Clare. In 2009, Walker Books published the third book of the series worldwide. It is a journey that explores Simon's and Clary's experience in the Shadowhunter city, and Clary works on saving her mother, as they travel from New York institute to Alicante, Idris.