City of Fallen Angels by by Cassandra Clare
City of Fallen Angels takes place after the events of City of Glass. It splits its focus between Jace and Clary and Clary’s best friend, Simon, and how he adjusts to life as a vampire, but it’s still an ensemble-cast story, and all the characters from the Mortal Instruments series appear in it: Jace, Isabelle, Alec, Magnus, Luke, Jocelyn, Maia, and many more. (It even helps to have read The Clockwork Angel before you read CoFA, because some of the characters from the ID series do show up in it. However, it isn’t required.) In City of Fallen Angels, someone’s killing the Shadowhunters who used to be in Valentine’s Circle and leaving their bodies around New York City in a manner designed to provoke hostility between Downworlders and Shadowhunters. Internecine warfare among vampires is ripping the Downworld community apart, and only Simon — the Daylighter who everyone wants on their side — can decide the outcome; too bad he wants nothing to do with Downworld politics. Meanwhile Jace and Clary investigate a mystery that has deeply personal consequences for them — consequences that may strengthen their relationship, or rip it apart forever. Love, blood, betrayal and revenge: the stakes are higher than ever in City of Fallen Angels.
Hmmm . . . I don't really like the cover. It has the basic elements from the others, it just doesn't click.