The Host by Stephenie Meyer

Melanie Stryder refuses to fade away. The earth has been invaded by a species that take over the minds of human hosts while leaving their bodies intact. Wanderer, the invading "soul" who has been given Melanie's body, didn't expect to find its former tenant refusing to relinquish possession of her mind.

Used hardcover in dust jacket, minor wear, binding tight, pages bright, a very nice copy!