Secrets of Blackthorn Hall by Cassandra Clare

Experience this Shadowhunters story in a beautiful physical edition, collecting characters’ letters and secrets from the across the world of Cassandra Clare’s beloved series.

Secrets of Blackthorn Hall is an illustrated epistolary novel by Cassandra Clare that was part of the Seasons of Shadowhunters Kickstarter campaign, now widely available in trade for the first time.

Julian and Emma are on their travel year when the Clave sends Julian a message: clean up Blackthorn Hall or ownership reverts back to the Clave. Amidst the clutter and disrepair, they discover secrets that Blackthorn Hall has kept hidden for years… including that something (or someone) else might be sharing the space with them.

Bridging the gap between The Dark Artifices books and the upcoming Wicked Powers series, this book offers an exciting glimpse at what’s to come for Shadowhunters fans ahead of The Wicked Powers (2026).

About the Author: Cassandra Clare is the author of the #1 New York Times, USA TODAY, Wall Street Journal, and Publishers Weekly bestselling Shadowhunter Chronicles. She is also the coauthor of the bestselling fantasy series Magisterium with Holly Black. The Shadowhunter Chronicles have been adapted as both a major motion picture and a television series. Her books have more than fifty million copies in print worldwide and have been translated into more than thirty-five languages. Cassandra lives in western Massachusetts with her husband and three fearsome cats. Visit her at CassandraClare.com. Learn more about the world of the Shadowhunters at Shadowhunters.com.

17 Mar 2026
 

Secrets of Blackthorn Hall by Cassandra Clare ISBN 9781837841561