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On Shadowhunters Season 3 Episode 21, Clary comes up with a plan that will bring Shadowhunters and Downworlders together, as Alec struggles to help Magnus.
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.
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?
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.
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.
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.
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?
On Shadowhunters Season 3 Episode 14, Isabelle asks Alec for help in tracking down information on the Clave's downworlder prison, and Jace takes Clary on a special date.
On Shadowhunters Season 3 Episode 13, Jordan and the Praetor continue their search for Heidi, and Isabelle gets information about the Clave prisons.
On Shadowhunters Season 3 Episode 12, Simon is determined to get rid of the Mark of Cain, and Clary desperately tries to escape her current situation.