Shadowhunters The Mortal Instruments 3 - Episode 20 - City Of Glass

Part 1 

Part 2 

Part 3

Part 4

Alec, Jace and Isabelle make a plan to finally get Clary back and stop Jonathan, much to Luke's and Simon's chagrin; Magnus struggles to deal with his father's reappearance; Maia must make a tough decision that could affect the rest of her life.