Explore Blackthorn Hall in this illustrated Shadowhunters mystery, told through letters, diary entries, and text messages of beloved characters from the Mortal Instruments, Infernal Devices, Dark Artifices, and the Last Hours.

Shadowhunters Emma Carstairs and Julian Blackthorn are travelling the globe when the Clave orders them to clean up Blackthorn Hall, a crumbling Gothic mansion hidden away in Chiswick, London—or else the Clave will demolish it once and for all.

Amidst the clutter and disrepair, Emma and Julian discover secrets Blackthorn Hall has kept buried for years. Something (or someone…) else haunts the Blackthorn family’s cursed home. With the help of their friends and family, Emma and Julian must restore the hall to its former glory and solve the mystery of the spectral presence which threatens any who interfere, while entertaining Shadowhunter visitors from both sides of the Atlantic.

Join beloved characters and fan-favourites in this lovingly illustrated epistolary adventure that bridges the gap between The Dark Artifices and The Wicked Powers series. Originally serialized on Tumblr and funded through a hit Kickstarter campaign, Secrets of Blackthorn Hall is now available for trade for the first time.

Cassandra Clare is the author of the #1 New York Times, USA TODAY, Wall Street Journal, and Publishers Weekly bestselling Mortal Instruments series and the Infernal Devices trilogy, and co-author of the Bane Chronicles with Sarah Rees Brennan and Maureen Johnson. Her books have more than 36 million copies in print worldwide and have been translated into more than 35 languages. Cassandra lives in western Massachusetts.

Cassandra Jean is a freelance illustrator and comic artist of The Mortal Instruments graphic novels, who spends her days toiling with a pen in her hand, and her faithful dog sleeping at her feet. The radio is always on and Gatorade is a constant source of power! Her interests include video games, tattoos and town festivals. She has had works published both in the United States and abroad.