Simon tries to enter the Seelie realm whilst Raphael faces a heartbreaking loss. Jace has a suspicion about who this new, unknown Greater Demon may be, which has been nicknamed the Owl. Alec hosts a family dinner with help from Magnus.
The Shadowhunters try to track down the new imposing threat, while Jace has a suspicion that Jonathan is back and behind the mundane attacks. Simon tries to figure out what The Seelie Queen did to him during his time in the glade. Alec decides to host a Lightwood family dinner at Magnus' house after a surprising visit from Maryse.