Eclipse is the third book in the Twilight series by Stephenie Meyer. It continues the story of 18-year-old Bella Swan and her vampire love, Edward Cullen. Eclipse is preceded by New Moon and followed by Breaking Dawn. The book was released on August 7, 2007 with an initial print run of 1 million copies, and sold more than 150,000 copies in the first 24 hours alone.
Eclipse was the fourth bestselling book of 2008, only behind Twilight, New Moon, and Breaking Dawn, and was also ranked #1 on Publishers Weekly's list of "Bestselling Hardcover Backlist Children's Books" in 2008 with over 4.5 million copies sold.
Plot SummaryThe story opens with the revelation that Seattle, Washington is being plagued by a string of unsolved murders, which Edward suspects is caused by a young vampire that is unable to control its thirst for human blood. As Edward and Bella apply to colleges, Bella explains to Edward her desire to see her werewolf friend, Jacob Black, again. Although Edward fears for her safety, Bella insists that neither Jacob nor his werewolf pack would ever harm her, and she begins visiting him occasionally. Meanwhile, Alice Cullen has a vision that Victoria, a vampire who is hunting Bella for revenge, has returned to Forks. A few days later, Edward proposes to Bella and, despite having an aversion to marriage, she accepts.
Bella and the Cullens realize that the murders in Seattle are being committed by an "army" of newborn vampires, controlled by Victoria. The Cullens join forces with the werewolf pack to combat this threat. As everyone else prepares for battle, Edward, Bella, and Jacob camp up in the mountains, hidden during the battle, where they are later joined by Seth Clearwater, a young member of the werewolf pack, to wait out the fight.
In the morning, Jacob becomes upset when he overhears Edward and Bella discussing their engagement and threatens to join the fight and get himself killed. To stop him, Bella kisses Jacob and comes to realize that she also loves him. During the battle, Victoria tracks Edward's scent to where Bella is hidden in the woods, and Edward is forced to fight. After Victoria and her army are successfully destroyed, Bella explains to Jacob that while she loves him, her love for Edward is greater. After receiving a wedding invitation from Edward, Jacob runs away in his wolf form to escape his pain, angry and heartbroken at Bella's decision to become a vampire.
source: http://en.wikipedia.org/wiki/Eclipse_(novel)