It's about the angel children coming to fight this war against half-angel and half-demons to save their nephilim , Clary's brother ,Sebastian, returns and leads the half-breeds as clary and jace are against him to protect their people and the humans. I like the dramatic scenes as well as the times when they are fighting. It's very full of detail and is a very interesting series full of events and plot twists that make you want to just keep reading. It's a good book to read if you like things like demons and angels and fighting good and evil.