The Host is a science fiction romance novel by Stephenie Meyer. Set in a post-apocalyptic world, the story follows a young woman named Melanie Stryder, who becomes a host for an alien parasite known as Wanderer. As Melanie and Wanderer's consciousness merge, they form an unlikely bond and embark on a journey to find Melanie's loved ones. This unique novel explores themes of identity, love, and the complexities of human nature in the face of an alien invasion.