Cassandra Clare will conclude her popular series of young adult fantasy novels, The Shadowhunter Chronicles, with a new trilogy of books.

Alfred A. Knopf Books for Young Readers will publish Clare’s The Wicked Powers trilogy, the publisher announced in a news release. The first volume of the new trilogy is slated for publication in the spring of 2026; according to Clare’s website, it will be titled The Last King of Faerie.

The Shadowhunter Chronicles, set in a world populated by both mythical creatures and regular humans, kicked off in 2007 with City of Bones, the first volume in The Mortal Instruments series. Five more books in that series followed, as did more series of novels: The Infernal Devices, The Dark Artifices, The Eldest Curses (co-written with Wesley Chu), and The Last Hours.

The Shadowhunter Chronicles spawned a 2013 film, The Mortal Instruments: City of Bones, and a television series, Shadowhunters, that ran from 2016 to 2019.

Knopf will also publish a romantasy duology, In Fire Foretold, that is unrelated to the Shadowhunter Chronicles world. The publisher says the books will follow a “young woman who must learn to control her dangerous magical abilities in order to save her kingdom.” There is no projected publication date for those novels.

In a statement, Clare said, “I am delighted to have Knopf and Penguin Random House as my publishers for this last trilogy in the Shadowhunters world. They truly understand what it means…to wrap up such an epic tale that has been told over so many years. I’m also excited to be launching my next YA series—a kickass portal fantasy that contains a ton of things I love, from a bold and reckless heroine to a magical wasteland filled with terrifying monsters that must be fought to a love triangle with two very unusual cursed princes.”

Michael Schaub is a contributing writer.