Cassandra Clare released the cover of the next book in her Mortal Instruments Series. Book 4: City of Lost Souls will be released on May 8th and I can not be any more excited! As you may know, Book 1: City of Bones is in pre-production with Lily Collins slated to play Clairy. This cover is fantastic and I can't wait to read it! You can pre-order it now at Simon & Schuster, Barnes & Noble, Books-A-Million and more!