Cassandra Clare sold books five and six in her bestselling YA series The Mortal Instruments to editorial director Karen Wojtyla at Margaret K. McElderry Books (Simon & Schuster), via agent Barry Goldblatt. The series, about a teenage demon slayer, debuted in 2007 with City of Bones, which was followed by City of Ashes and City of Glass. The fourth book, City of Fallen Angels, is scheduled to be published next April.
The two new books—City of Lost Souls and City of Heavenly Fire—are scheduled to be published in May 2012 and September 2013.