Shadowhunters premiered in 2018.
Shadowhunters . The show received a straight-to-series order on March 30 , 2015 , and premiered on January 12 , 2016 on Freeform . In March 2016 , it was announced that the series had been renewed for a second season of 20 episodes , which premiered on January 2 , 2017 . The Mortal Instruments is a series of six young adult fantasy novels written by Cassandra Clare , the last of which was published May 27 , 2014 .