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Shadowhunters 219-220 synopsis

Shadowhunters” Season 2B – Mondays through August 14, 2017
August 7 (8:00 – 9:01 p.m. EDT) – Episode 2019 – “Hail and Farewell”
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. But what starts off as a way to preserve their own, the Downworlders choice to break with the Shadowhunters, could quickly escalate to war.  
August 14 (8:00 – 9:01 p.m. EDT) – Episode 2020 – Summer Finale – “Beside Still Water”
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.   

source: disneyabcpress.com

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