Isabella Swan moves to gloomy Forks to live with her father. As she starts her junior year in high school she becomes fascinated by Edward Cullen who holds a dark secret which is only known by his family. Edward falls in love with Bella as well but knows the further they progress in their relationship the more he is putting Bella and those close to her at risk. Edward warns Bella that she should leave him but she refuses to listen and to understand why he is saying this. Bella learns his secret. He is a vampire, however she is not afraid of his blood-thirsty needs and the fact he could kill her at any moment. Bella is afraid of losing him, the love of her life. The thrill begins when a new vampire finds it a challenge to hunt Bella down for her irresistible blood. The game is on and James will not stop until she is killed.

After Bella recovers from the vampire attack that almost claimed her life, she looks to celebrate her birthday with Edward and his family. However, a minor accident during the festivities results in Bella's blood being shed, a sight that proves too intense for the Cullens, who decide to leave the town of Forks, Washington for Bella and Edward's sake. Initially heartbroken, Bella finds a form of comfort in reckless living, as well as an even-closer friendship with Jacob Black. Danger in different forms awaits.

Bella once again finds herself surrounded by danger as Seattle is ravaged by a string of mysterious killings and a malicious vampire continues her quest for revenge. In the midst of it all, she is forced to choose between her love for Edward and her friendship with Jacob -- knowing that her decision has the potential to ignite the struggle between vampire and werewolf. With her graduation quickly approaching, Bella is confronted with the most important decision of her life.

Bella and Edward are to marry. Jacob becomes upset when he learns that Bella is planning to consummate the marriage on her honeymoon. The wedding over, Bella and Edward spend their honeymoon on the Cullen's idyllic private island. But, to their dismay, they discover that Bella is pregnant. The fetus is growing at an accelerated rate and everyone fears for Bella's safety. Will she go ahead with her pregnancy, whatever the cost? The Quileutes close in as the unborn child poses a threat to the Wolf Pack and the towns people of Forks.

Bella trains her new abilities with Edward Cullen and they are happy to see their daughter Renesmee growing very fast. Jacob Black has an imprint with the child, irritating Bella. When the vampire Irina sees Renesmee with Bella and Jacob, she believes that the child is immortal and she visits Aro Volturi and tells what she saw. Volturi believes that the girls is a threat to the vampires and decide to travel to Forks to kill Renesmee and her parents. Alice Cullen has a premonition with the Volturi coming to Forks and Edward and Bella visit other clans to convince them to protect Renesmee from the Volturi together with Jacob's pack. The battlefield is ready for a bloody fight.