Shadowhunters TV Clary Fairchild's hero Kinjhal daggers in a shadowbox frame. Plaque states: Shadowhunters/ Season 3 Finale. Executive Producer Robert Kulzer. August 3, 2018. (28"x16"x2"). Shadowhunters is an American supernatural drama TV series developed by Ed Decter, based on the popular book series The Mortal Instruments written by Cassandra Clare. Premiered on January 12,2016. The series follows Clary Fray (Katherine McNamara) who finds out on her eighteenth birthday that she is not who she thinks she is, but rather comes from a long line of Shadowhunters, human -angel hybrids who hunt down demons. From the production offices archives of Constantine Films.