Theory 10: Cecily Herondale & Gabriel Lightwood
Anyone who hasn’t read Clockwork Prince and doesn’t want any spoilers should stop reading NOW!
I wasn’t at all suprised when Cassie introduced the mysterious Cecily into the series and revealed that she was Will’s sister. Not sounding cocky it was just very well planned out and made sense. However her purpose in the story is a little fuzzy but thats another theory for later.
Clockwork Prince explores many relationships between previously mentioned and new characters. The auidence is also furthur introduced to the Lightwood family and more information is shared on their circumstances. Gideons relationship with Sophie was such a subtle yet crucial part of the story. By seeing how the menace family had been influenced by their father Benedict, I was able to put a fairly reasonable theory together.
The scene where Will, Tessa and Charlotte visit the Lightwoods to talk about the insitiute shows a different side to Gabriel and changed our overall opinion of him. Gabriel is clearly arrgoant and stubborn however his malicious manner is clearly shaped and influenced by his father, underneath it all he cares for his family and as hard as he tries to hate he simply can’t. He is therefore loyal and kind hearted. We believe that in Clockwork Prince we will see Gabriel undergo a major character change as he will rise to stand next to his brother and fight alongside the Institute.
My theory is that in book 3: Clockwork Princess, something will drive Gabriel into the institute where he will meet Cecily Herondale. I believe that because of Will’s public humiliation of Gabriels sister, he will try to get under Will’s skin by messing around with Cecily. When Gabriel and Cecily begin to spend time together it is very possible that Gabriel will fall in love with her, like Gideon did for Sophie; and that is where the current Lightwoods from the Mortal Instruments will have descended from.
Because the Infernal Devices will have a heart shattering conclusion, as we all know that our favourite characters, exluding Tessa and Magnus, must die and be dead when the Mortal Instruments is taking place. As Tessa lives (and we’re hoping that Will or Jem will find someway to remain immortal, which could be discovered in COLS) its still going to devastate readers when we realise Tessa is alone for eternity therefore Cassie must have some form of happy ending which can be seen through Charlotte and Henry and their child, Gideon and Sophie and Gabriel and Cecily. Is this how the Lightwoods name will be restored?

