Riley Biers (Xavier Samuel) is attacked and bitten by Victoria (Bryce Dallas Howard), in order to begin creating an army of newborns set to destroy Bella Swan (Kristen Stewart). Back in Forks, Edward Cullen (Robert Pattinson) and Bella discuss the complications of becoming an immortal vampire. At 18 years old, one year older than the age Edward was when he became a vampire, Bella expresses her aversion to the idea of marrying so young, though Edward refuses to turn her until they are married and she's had various human experiences she would otherwise miss. While Charlie Swan (Billy Burke) investigates the disappearance of Riley Biers, Edward suspects his disappearance was caused by the newborn vampires. Furthering his suspicions is the intrusion of Riley into Bella's room.
Although Edward fears for her safety, Bella insists that Jacob Black (Taylor Lautner) and the rest of the werewolf pack would never harm her, but Edward is still not convinced. Bella goes to La Push to see Jacob, and returns home unharmed. During one of her visits, Jacob confesses that he is in love with Bella, and forcefully kisses her. Mad, she punches him and breaks her hand, and Edward later threatens to break Jacob's jaw. Bella even revokes the invitations of Jacob and his pack members to her graduation party, but when Jacob apologizes for his behavior, she forgives him.
Meanwhile, Alice (Ashley Greene) sees a vision that the newborn army is attacking Forks led by Riley Biers. Jacob, accompanied by Quil (Tyson Houseman) and Embry (Kiowa Gordon) overhear this, which leads to an alliance between the Cullens and Wolf pack. Later, the Cullens and the wolves agree to a meeting place and time to train and discuss strategy. During the training Jasper (Jackson Rathbone) explains to Bella that he was created by a vampire named Maria to control a newborn army. He hated his original existence and upon meeting Alice, joined the Cullens with her. Bella sees the true bond between a mated vampire pair and begins to understand Jasper better. Despite her reluctance to marry, Bella realizes that spending eternity with Edward is more important to her than anything else and agrees to marry him. Edward and Bella camp up in the mountains to hide Bella from the bloodthirsty newborns. During the night, Bella overhears a conversation between Edward and Jacob, in which they temporarily put aside their hatred towards each other. In the morning, Jacob overhears Edward and Bella discussing their engagement and becomes very upset. Before he can run off to get himself killed in the fight with the newborns, Bella desperately asks him to kiss her, and she realizes that she has fallen in love with him. Edward finds out about the kiss but is not angry, as Bella says she loves him more than Jacob.
Victoria eventually finds Bella's hiding spot, and Edward kills her while Seth kills her partner Riley. The Cullens and the Quileute wolves, meanwhile, destroy her "army", though Jacob is injured saving Leah Clearwater from a newborn. Several members of the Volturi arrive to deal with the newborn army. They also see that the Cullens are guarding the newborn, Bree Tanner (Jodelle Ferland), who had refused to fight and surrendered to Carlisle. Jane (Dakota Fanning) tortures Bree to get information, then instructs Felix to kill her, despite the Cullens' efforts to spare her. When Jane notes that Caius will find it interesting that Bella is still human, Bella informs her that the date for her transformation has been set. Bella visits the injured Jacob to tell him that even though she is in love with him, she has chosen to be with Edward. Saddened by her choice, Jacob reluctantly agrees to stop trying to come between her and Edward.
Bella and Edward go to their meadow, where she tells him she has decided to do things his way: get married, make love, then be transformed into a vampire. She also explains that she never has been normal and never will be; she's felt out of place her entire life, but when she is in Edward's world she feels stronger and complete. At the end of the story they then decide they need to tell Charlie about their engagement.
Italiano
Bella torna a Forks con Edward dopo la disavventura con i Volturi in Italia. La ragazza deve scegliere tra continuare la sua amicizia con il licantropo Jacob o smetterla di vederlo dato che Edward è estremamente infastidito dal loro rapporto. Intanto, Victoria, la vampira nomade che faceva parte del clan di James, segue Bella per vendicare la morte del suo compagno ucciso dalla famiglia Cullen. La sua presenza diventa tangibile per Edward e Bella quando sui giornali appare la notizia di vari efferati delitti compiuti da sconosciuti nella città di Seattle. I ragazzi intanto, si preparano per il diploma, evento che significherà la fine della vita mortale di Bella, dato che Carlisle le aveva promesso che dopo essersi diplomata l'avrebbe trasformata in vampiro.
Il continuo intromettersi di Jacob comincia a dare seriamente fastidio ad Edward che però si rende conto che in sua compagnia, Bella è al sicuro da un eventuale attacco di Victoria. Dato l'imminente ed inevitabile scontro che i Cullen dovranno affrontare con Victoria e i vampiri neonati, Jasper decide di allenare la sua famiglia e il branco di licantropi Quileute, ad affrontare il gruppo di Victoria, dimostrando una eccellente preparazione nel combattimento, dovuta ai suoi trascorsi tempi passati in un altro clan di vampiri. Il giorno dello scontro arriva e i vampiri e i licantropi si alleano contro il nemico comune proteggendo Bella e studiando una strategia di combattimento.
Il giorno prima dello scontro, i ragazzi si accampano lontano dal luogo in cui avverrà la battaglia. Bella, per paura che Edward possa rimanere ucciso, gli chiede di rimanere con lei e il vampiro accetta, anche se è un po' preoccupato al pensiero della sua famiglia nel pieno dello scontro. Con loro resta anche Jacob, che con la sua temperatura corporea aiuta Bella a non morire di freddo durante la notte. Jacob, turbato per la scelta di Bella di amare Edward, decide di raggiungere il resto del gruppo sul campo di battaglia, prima però chiede alla ragazza di dimostrargli con un bacio che lei tiene alla sua vita. Bella accetta di baciarlo e nel farlo si rende conto di amare entrambi dando a Jacob una speranza.Intanto, la battaglia con i vampiri neonati si rivela uno scontro molto cruento e a proteggere Bella, unico vero obiettivo di Victoria, rimangono Edward e il licantropo Seth. Victoria raggiunge Bella insieme a Riley, il suo nuovo compagno. Durante lo scontro, Riley viene ucciso da Seth mentre sarà Edward ad uccidere Victoria davanti agli occhi di Bella. Finito lo scontro, le famiglie si riuniscono, tuttavia Jacob rimane gravemente ferito da un attacco di un vampiro sopravvissuto. Bella va a fare visita a Jacob che gli dimostra che aspetterà Bella anche dopo la sua "trasformazione" in vampiro.
Bella ed Edward seduti sul prato decidono di rendere ufficiale il loro futuro matrimonio informando il papà di Bella di tale avvenimento.
Français
La famille Cullen est de retour à Forks. Alors que Bella et Edward en sont à leur dernière année de lycée, ils vivent le parfait bonheur après la demande en mariage d'Edward, qui a quelque peu chamboulé Bella, car Edward a accepté de la transformer en vampire à la simple condition que le mariage soit prononcé entre eux deux. Cependant, ils doivent faire face à un obstacle, Jacob Black. Le meilleur ami de Bella en est fou amoureux et refuse de prêter une relation à Bella avec Edward. Parallèlement, une série de crimes, plus affreux les uns que les autres, touche la ville de Seattle. Rivaux ou pas, vampires et loup-garous devront s'unir pour faire cesser ces drames, dont une ennemie assoiffée de vengeance est peut-être à l'origine. Pendant ce temps, Bella se doit de choisir entre l'amour qu'elle éprouve pour Edward ou son amitié fusionnelle avec Jacob.