Five stars because you've never read a novel quite like this one. It's invasion of the body-snatchers, but the body-snatchers are... good? 
 The Host is a sci-fi alien invasion fiction, with a story unlike any other. Our Narrator, Wanderer, is a Soul-- one of the aliens. But aliens are good. They are kind, patient, understanding, and self-less. They have created a peaceful, calm environment out of our previously hectic one in Earth. But Wanderer's life is anything but peaceful. Somehow, the person her body once was is still there-- and fighting back. 
 Melanie Stryder is a human-- or was. The aliens invaded, but for a while, she and her brother, Jamie, were safe. But nothing gold could last, and Melanie was caught. Now there's an alien inside her, and nothing she holds dear is safe. She's weakening slowly, and she can keep the whereabouts of her brother and lover safe for only so long. 
 In a twisted journey through the desert of the land and the fortress of their hearts, Wanderer and Melanie travel to find what being human really means.