"Breaking Dawn" is the fourth and final book in the Twilight series by Stephenie Meyer. It follows the story of Bella Swan as she marries Edward Cullen, a vampire, and faces the challenges of their new life together, including pregnancy and the complexities of their supernatural world. The novel is divided into three parts, with the first focusing on the wedding and honeymoon, the second narrated by Jacob Black, a werewolf, and the third returning to Bella's perspective. The story culminates in a confrontation with the Volturi, a powerful vampire coven, testing the bonds of love and loyalty.