Clary is back in New York, training to be a Shadowhunter. Finally being able to call Jace her boyfriend is a great relief. However, Jace begins to distance himself from Clary. He has been suffering with nightmares, which terrify him, as he sees himself hurting Clary.Meanwhile, Simon has issues of his own. The mark Clary placed on him during the battle in Idris is an ancient one that has hidden implications.Can Jace overcome his nightmares? Will Simon's mark become a burden and a curse?This is the fourth book in The Mortal Instrument series. It is another fantastically well written story by Cassandra Clare that swept me away!Clary is finally happy: Her mother has recovered from her coma and is planning to get married to Luke, and Clary is able to call Jace her boyfriend. However, Jace is putting some distance between Clary and himself due to his nightmares.Simon is struggling to keep his secret from his mother and decides to move out.The Lightwood's are still mourning the death of Max.There are some more characters brought into the story: Jordan, Camille and Lilith. These characters bring even more adventure and depth to the series. A character (who shall remain nameless) makes a surprise return. The ending finished on a cliffhanger that left me gasping! I have absolutely fallen in love with this series! It has gripped my imagination and left me wanting more! Luckily, my wish is to come true, as the fifth book, The City of Lost Souls, is due for release soon. I highly recommend this book, and series, to everyone who loves to read YA/YA Romance/Action/Adventure.