Shadowhunters, also known as Shadowhunters: The Mortal Instruments, is an American supernatural drama television series developed by Ed Decter, based on the novel series The Mortal Instruments written by Cassandra Clare. It premiered in North America on Freeform on January 12, 2016. Primarily filmed in Toronto, Canada, the series follows Clary Fray, who finds out on her eighteenth birthday that she comes from a long line of Shadowhunters, human-angel hybrids who hunt down demons, and has to deal with the struggle of forbidden love.

Judith Lewis, better known by her pen name Cassandra Clare, is an American author of young adult fiction, best known for her bestselling series The Mortal Instruments.