This book also came in the in the box set that I bought of this series. I really enjoyed this book, just as much as the previous books in the series.
This book was just as well written as the previous books but this book had a lot more fighting and wars. My favourite character in this book was Magnus, he was pretty hilarious in this book and he helped out Clary when she needed it. I also thought that when Alec came out to his parents, Magnus' reaction was very entertaining.
This book starts with the Lightwoods going to Idris without Clary because Jace lied to her as he didn't want her to go. Clary then draws a portal rune to take her to Idris and Luke follows her to protect her. Because of wards on the city, Clary lands in Lake Lyn, the lake that Raziel came out of to give Jonathon Shadowhunter the mortal instruments, however the water drives people insane and Luke takes her to his sister's house where she heals her. Clary then goes to see Jace where he yells at her for coming, while there she also meets Sebastian and Aline, who are cousins and are who the Lightwoods are staying with. Sebastian takes Clary to Ragnor Fell who will help her mother, however he has been killed and Magnus is there in his place and tells Clary she must retrieve the Book of White from Jace's childhood home. Clary and Jace get the book, however when they return to Alicante a massive war is going on because Valentine has destroyed the wards around the city and demons are running wild. Jace, Clary and Alec go to free Simon from the prison he was put in as the building is on fire. While there they also free Hodge, whho tells them that the Mortal Glass is Lake Lyn however he is then killed by Sebastian who runs off. Max was also killed by Sebastian that night and the Lightwoods are devastated. Jace goes to find Valentine through tracking Sebastian, however we learn from Jocelyn, who Magnus revived, that Sebastian is Clary's brother and Jace was Stephen Herondale's child. Clary makes a rune that binds downworlders and shadowhunters together so they can share each others abilities in battle, then Clary goes to Lake Lyn to stop Valentine. Valentine binds her up and then Jace comes to save her after killing Sebastian, however Valentine kills him first. Clary then draws a rune over the summoning runes that Valentine drew so when Raziel is summoned he kills Valentine and lets Clary have one wish. She wishes for Jace. The books ends with all the characters, friends again, and watching the celebratory fireworks together.