Episode 11: Lost Souls
In the emotional midseason premiere, everyone is dealing with the loss of Clary and are trying to move on best they can. Unbeknownst to them, the Shadowhunters face a new level of evil that they can’t even imagine with the arrival of Jonathan Morgenstern.
Episode 12: Original Sin
Simon is determined to get rid of the Mark of Cain and, with Isabelle’s help, tries to track down New York’s oldest vampire to get more information on the mark. Now in Paris, Clary desperately tries to find an escape from her current situation. Meanwhile, with his new sense of mortality, Magnus tries to live life to the very fullest.
Episode 13: Beati Bellicosi
Jordan and the Praetor try to track down Heidi, while the Shadowhunters try to locate Jonathan. Meanwhile, Luke looks to Maryse for help and Isabelle gets a possible lead on information on what is really going on in the Clave prisons.
Episode 14: A Kiss From A Rose
Continuing to track down information on the rumors about misconduct at The Clave’s Downworlder prison, Isabelle asks Alec for help. Meanwhile, Magnus succumbs to asking Lorenzo for a favor and Jace takes Clary on a special date.
Episode 15: To The Night Children
As the saying goes, “rules are made to be broken.” But what if the rules are there for a reason? Several members of the team must examine the reasoning behind certain rules after consequences to questionable actions come to light. Whether the rules were broken because of love, loyalty or revenge, does the end justify the means?
Episode 16: Stay With Me
Clary and Jace come up with a risky plan to get rid of her twinning rune, which may bring an old enemy back into the fray. Meanwhile, Alec is worried about Magnus.
Episode 17: Heavenly Fire
Simon and Izzy team up on a secret mission to figure out what the Clave is hiding. Meanwhile, Clary is conflicted about Jonathan as the Shadowhunters try to get answers.
Episode 18: The Beast Within
A demon outbreak in New York City on Halloween becomes a top priority at the Institute, but as the Shadowhunters hunt the demons, Jace becomes more worried about Clary. Meanwhile, Alec has to juggle the outbreak with his deep concern about Magnus’ depression.
Episode 19: Aku Cinta Kamu
To try and save Clary from Jonathan, Jace goes undercover. Back at the Institute, Isabelle, Simon and Luke race to find a way to finally destroy Clary’s bond with Jonathan. With time running out, can Isabelle create the solution before Jace’s cover is blown?
Episode 20: City of Glass
Alec, Jace and Isabelle make a plan to finally get Clary back and stop Jonathan—much to Luke’s and Simon’s chagrin. Meanwhile, an emotionally raw Magnus struggles to deal with his father’s reappearance and Maia must make a tough decision that could affect the rest of her life.
Episode 21: Alliance
Alliance is the upcoming twenty-first episode of the third season of Shadowhunters: The Mortal Instruments.
Episode 22: All Good Things…
City of Glass is the upcoming twenty-second and final episode of the of Shadowhunters: The Mortal Instruments.