Cassandra Clare’s last Mortal Instruments book has yet to be released, yet she has announced her book plans far into the future.
After City of Heavenly Fire is released May 27, Clare will be working on three series simultaneously: The Dark Artifices (the sequel to The Mortal Instruments), The Last Hours (the sequel to prequel series Infernal Devices), and Magisterium (a pentology she is co-authoring with Holly Black, set outside the Shadowhunter World.)
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