New Moon is a young adult fantasy-romance novel by author Stephenie Meyer, and is the second book in the Twilight saga. According to Meyer, this book is about losing true love. The title refers to the darkest phase of the lunar cycle, indicating that New Moon is about the darkest time of the protagonist Bella's life. It was originally published in hardcover in 2006. An upcoming film adaptation is tentatively set for release on November 20, 2009.

Isabella "Bella" Swan turns 18. Alice and Edward Cullen, the vampire she loves, throw her a birthday party. While unwrapping a gift, she gets a small paper cut. Edward's brother, Jasper, is overwhelmed by her blood's scent and tries to attack Bella. To protect her from vampires, Edward ends his relationship with Bella, and he and his family leave Forks, Washington. Bella becomes severely depressed for months and seeks comfort with Jacob Black, a cheerful friend who eases her pain over losing Edward.
Bella and Jacob develop a close friendship, and she soon realizes that thrill-seeking activities, such as motorcycle riding, allow her to "hear" Edward's voice in her head. Meanwhile, Bella learns that Jacob is a werewolf. He and his fellow werewolves protect Bella from the vampires Laurent and Victoria, the latter of whom seeks revenge for her dead mate, James, whom the Cullens killed in Twilight.
Meanwhile, a series of miscommunications leads Edward to believe that Bella has killed herself. Distraught over her supposed suicide, Edward flees to Italy to provoke the Volturi, peace-keeping vampires who would be able to kill him. Bella and Edward's sister, Alice, rush to Italy to save Edward, arriving just in time to stop him. Before leaving Italy, the Volturi tell them that Bella, a human who knows that vampires exist, must either be killed or transformed into a vampire. When they return to Forks, Edward tells Bella that he has always loved her and only left to protect her. She forgives him, and the book ends with the Cullens voting in favor of Bella being transformed into a vampire after her graduation, much to Edward's dismay.