City of Glass is the twentieth episode of the third season of Shadowhunters: The Mortal Instruments.


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.




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TMI 3x20 Promo Preview

Demons attack Idris.


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A list of the songs and score music featured in this episode:

  • "Part of Me" - Gold Brother
  • "The Push" - DYAN
  • "The Ending" - Wafia feat. Finneas
  • "Bridges" - Aisha Badru
  • "Romance. Andante from Eine kleine Nachtmusik, K.525" - Leonard Bernstein & New York Philharmonic


  • The title of the episode is a reference to Alicante—which is sometimes referred to as the City of Glass—as well as the title of the third installment of The Mortal Instruments book series.
  • Some of the exterior shots set in Alicante in this episode were filmed in Paris.[1][2]
  • Parts of this episode was changed following the cancellation of the series and the creation of the two-part finale. This episode was originally supposed to end with a cliffhanger that was since incorporated into the finale episodes.[3]


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