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Jace and Clary rush to make a final stand, but when a traitor is revealed, Jace and Clary may have a bigger fight on their hands than expected. Meanwhile, Alec and Izzy must fight off a large mass of demons that have unexpectedly shown up, as Luke and Simon head to the Seelie Court to deal with some unfinished business with the Seelie Queen.

After centuries of being lied to and treated poorly by The Clave, the Downworlders decide to come together and take matters into their own hands as the hunt for Valentine and Sebastian intensifies.

After a devastating attack at The Institute, everyone is on high alert as the Shadowhunters close in on their hunt for Jonathan. Meanwhile, Simon and Maia help a new downworlder as the Seelie Queen demands an answer from Magnus and Luke.

With two of the three Mortal Instruments missing, everyone is on the hunt for the last one - The Mortal Mirror. Jace and Clary are on the hunt to recover it first before it could fall into enemy hands. But along the way, Clary realizes that her brother Jonathan may be closer than she thought. Meanwhile, Isabelle has a hard time accepting the fact that her little brother Max is growing up, and Maia struggles to bring her guard down with Simon.

Simon goes down a dark path while Alec and team prepares to transport Valentine.

Alec has big plans to mend fences with the Downworlders, while Jace and Clary are summoned by the Seelie Queen.

The Institute's leaders worry about a Downworlder uprise when Shadowhunters start turning up dead.

Clary feels pressured between picking Jace or Simon. Izzy settles issues with Raphael. Sebastian breaks his dad out of prison.

Everyone is coping with the aftermath of the Soul Sword attack at the Institute.

Valentine's scheme is in full effect and the Shadowhunters must race to save the Downworld.

With word leaking that Clary is a critical part of Valentine's plan, the Downworlders are at odds on how to take care of the situation.

Assigned with organizing his brother Max's Rune Ceremony, Alex feels this would be the perfect chance for his family to get to know Magnus.

To help find answers to what Valentine may be plotting, Isabelle and Clary are sent on an assignment to go see the Iron Sisters.

The Shadowhunters regroup after the assault on the Institute. Meanwhile, Simon moves home, but fights to adjust to his new life with his family around.

Clary continues to fight with the new Shadowhunter assignment as Jace is being held in The City of Bones with an unknown future, and all mistrust in the Shadowhunter world continues to rest on Valentine's daughter.

Jace is wanted by the New York wolf pack while he continues to be sought after by other Shadowhunters. Meanwhile, Simon desperately looks for Camille.

Alec and Isabelle hurry to locate Jace before the other Shadowhunters find and murder him. Meanwhile, Simon goes after Magnus' help when he discovers himself clashing with Raphael and Aldertree; and Clary battles to fit in while pining for her old, mundane life.

Only a short time has passed since Jace left with Valentine and all hell has opened up at The Institute. Alec, Isabelle and Clary are determind to locate Jace, but are quickly halted with the arrival of Victor Aldertree, who means business about getting the Institute back on the right path.