Earth has been inhabited by an intellegent alien species known as "Souls." Although an incredibly peaceful race, Souls can only survive by being inserted into a host body, taking control of their minds. In an effort to discover the secret whereabouts of some of the last remaining human resistances, the Soul Wanderer has been inserted into the human being Melanie Stryder, who was captured while attempting to locate her family. After insertion, Wanderer comes to realize an unsettling fact- Melanie has not faded away in consciousness, and in fact is putting up walls in her mind to prevent her family from being found. As time passes and Wanderer tries to break Melanie's walls, she begins to feel sympathetic toward the humans Melanie loves so dearly- her brother Jamie and her partner, Jared Howe. Wanderer becomes torn between loyalty to her own race, trying to give information to the argumentative Seeker assigned to her, and her blossoming love for the humans in her memories. As Wanderer's and Melanies trust builds, they embark on a journey through the desert to find the resistance, nearly dying in the process. Wanderer awakens to find herself captive in the den of the enemy, and realizes her problems have just begun: the humans want her dead, the doctor wants to experiment on her, she may have accidentally lead the Seekers here, and she has become hopelessly in love with Jared, the man who belongs to the human she occupies. What follows is an inspiring story of friendship, love, and loyalty in which the bonds of human brotherhood are tested, and an alien discovers that in all the planets in the universe she has experienced, humans are the only race she would give her life to save. . . .
