Almost Finished! Clockwork Princess Update (SPOILERS!)

I am almost finished with the third, and final book of The Infernal Devices series, The Clockwork Princess. If you are planning on maybe reading this book I suggest you stop here because there will be many spoilers in the next paragraph...

As I have said in previous posts, we know that Jem has asked the members of the London Institute, who are also like family to him, to stop searching for a cure for his illness. Jem's condition has worsened and has minimal yin fen (the drug he has to take to stay alive) left because Mortmain has bought all of it and prevented all new shipments to come in with anymore. Once everybody stops searching, Jem dies and the Silent Brothers come in to take him away. While this is all happening, Tessa was captured by Mortmain and no one knows where she has been taken. But Will might have a clue. There has been multiple times when a hint of Mortmain's where-abouts are. Cadair Idris. In Wales. Will is confronted with the problem of not leaving Jem's side or finding Tessa. Jem eventually tells Will to go and find her and so when Jem dies, Will is out on a long journey to Cadair Idris. One morning while Will was having breakfast at an inn, Will has this agonzing pain above his heart. Where his parabatai rune is inscribed. Jem has died. Will goes through so many different emotions while on his way to find Tessa. Eventually Will finds where Mortmain has Tessa hidden away and goes into the building. He searches the place and sees Tessa and runs toward her. They embrace but then Tessa says to Will that they are both now stuck in an invisble wall all around them and cannot get out. They speak about Jem and what had happened and both of their terrbile journey here. They both find themselves just waiting for Mortmain to see them both here and probably kill Will. Until the members at the Institute find a way to travel instantly to Cadair Idris to aid Will. These people include Henry and Charotte Branwell, the heads of the Institute, Cecily Herondale, Will's younger sister, The Lightwood Brothers, three Silent Brothers, Magnus, a warlock and some Mundanes that are of help to the Institute. Once they reach Cadair they split up to find Will and Tessa. Magnus is the one to find them and since he is a warlock, he is able to break the barrier that holds them there. They get dressed in their Shadowhunter gear and set off to find the others. Suddenly, Will here's a scream of horror. Cecily. The three of them burst into a battle between the Shadowhunters and the automatons. Immediatley Will throws himself into the mess and tells Magnus to watch Tessa, to make sure she doesn't fight. Tessa glances around and sees Henry crumpled on the floor, motionless. And Charlotte trying to comfort her, possibly, dead husband. She takes another look and sees one Silent borther lying dead on the ground. She quickly turns around to watch what is happening and she sees another automaton cease one of the three Silent Brothers by the neck and lift him up, only to see silvery hair and a pale face. Jem.

I've had so many questions along the way through out this book, but my biggest one yet is, How is Jem still alive?! I haven't been able to put this book down yet and hopefully I will finish soon.

Jem Carstairs, AKA Brother Zachariah