Bella Swan partecipa alla festa per il suo diciottesimo compleanno organizzata dalla famiglia Cullen. Finisce però col ferirsi con la carta di un regalo, scatenando la sete incontrollabile di Jasper e la sua reazione violenta. Edward interviene per proteggerla dall'attacco e si rende conto che per Bella lui e la sua famiglia sono una fonte perenne di pericolo. Così i Cullen decidono di lasciare Forks e Bella nella speranza che la ragazza lo dimentichi. Bella cade in una profonda depressione. Dopo circa sei mesi, Bella esce da questa crisi ma solo parzialmente grazie all'amicizia di Jacob Black. Questa amicizia viene presto messa in crisi da un nuovo segreto: Jacob Black sviluppa il gene del licantropo, nemici naturali dei vampiri ma deve tenerglielo nascosto e le sta lontano. Bella viene a conoscenza di questo segreto e i due ragazzi ricominciano a frequentarsi. Disperando del ritorno di Edward, Bella si dà, con la complicità di Jacob, a passatempi pericolosi.

Last time we see saw Bella Swan she was narrowly escaping the clutches of the evil vampire James while finding love with ''vegetarian'' vampire Edward Cullen. Bella and Edward's lives have been full of nothing but love and bliss however, it all changes one fateful day. On Bella's birthday, her new found friend and sister of Edward, Alice, decides to throw her lavish party, complete with balloons, ribbons and cake that could feed an army. All is well until Bella accidentally cuts her finger whilst opening a present. The result is that Jasper Hale, the newest addition to the Cullen clan, succumbs to his blood lust and attacks Bella. Edward decides that while he and his family are around, Bella's life will always be at risk. So he decides to leave her for her own good. Bella feels her life is over. Enter Jacob Black, a member of the Quilite tribe who manages to bring some joy and meaning back into Bella's life. However as the two become closer, Bella discovers Jacob has a secret of his own- he's a werewolf. As if that wasn't bad enough Bella can't seem to get the love of her life, Edward out of her mind. With new dangers, new friends and new enemies, Bella finds herself choosing between holding on to the past or accepting a new future. But what and more importantly who will she choose?