City of Fallen Angels is the fourth book in the The Mortal Instruments series by Cassandra Clare. The series was meant to end with City of Glass; it was announced in March 2010 that a fourth book would be added, with Cassandra Clare later saying that she views this as a "second trilogy" in the series. The book was released on April 5, 2011.
Simon receives an offer from a vampire named Camille Belcourt who claims to have been usurped by Raphael Santiago. She says that if Simon joins her side as the Daylighter, then he will finally earn his place in the vampire society. After his meeting, he returns home worried about what his mother would think as she has been suspicious since he went to Idris in City of Glass and did not return for a few days. Although Magnus Bane erased memories of his absence, she was still subconsciously suspicious about his whereabouts. As Simon tries to adjust to life as a vampire, he is attacked a couple of times and each time the Mark of Cain curse works and the attackers are killed or flee in terror. Anyone who tries to attack him quickly meets with a biblical "sevenfold" death. After coming home after one such an attack, his mother confronts him about the blood she has found hidden in his closet, and he is forced to tell her what he has become. She believes that he is no longer her son and begins to pray. Desperate, he tells her that its a bad dream and she, surprisingly, believes him, with the help of his persuasion powers as a vampire. Knowing that he can't go back to his mother's house, he moves in with his band's new member, Jordan Kyle. When Jace comes to Simon's apartment, he meets Kyle, and realizes that Kyle is, in fact, a werewolf.