"Jonathan Harker is travelling to Castle Dracula to see the Transylvanian noble, Count Dracula. He is begged by locals not to go there, because on the eve of St. George's Day, when the clock strikes midnight, all the evil things in the world will come full sway. But business must be done, so Jonathan makes his way to the Castle - and then his nightmare begins. His beloved wife Meena and other lost souls have fallen under the Count's horrifying spell....

Rose Hathaway has finally returned to St. Vladimir's and to her best friend, Lissa. But Rose's heart still aches for Dimitri, and she knows he's out there, somewhere. He has tasted her blood, and now he is hunting her. Only this time, he won't rest until Rose joins him--forever.

Still pursuing a cure for her mother's enchantment, Clary uses all her powers and ingenuity to get into Idris, the forbidden country of the secretive Shadowhunters, and to its capital, the City of Glass, where with the help of a newfound friend, Sebastian, she uncovers important truths about her family's past that will not only help save her mother but all those that she holds most dear.

As mysterious murders threaten the new peace between Shadowhunters and Downworlders, only Simon, the Daylighter vampire, can help bring both groups together.