What is the conflict of The Host by Stephenie Meyer?

The conflict in "The Host" revolves around the internal struggle of the protagonist, Melanie Stryder, who must navigate sharing her body with an alien "Soul" named Wanderer. Melanie resists giving up control of her body, while Wanderer grApples with conflicting emotions about her newfound human host and the human resistance fighters she encounters. The story delves into themes of identity, loyalty, and the complexity of human emotions.