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The Host by Stephenie Meyer
The earth has been invaded by a species that take over the minds of their human hosts while leaving their bodies intact, and most of humanity has succumbed. But Melanie Stryder refuses to fade away. Wanderer, the invading "soul" who has been given Melanie's body, knew about the challenges of living inside a human: the overwhelming emotions, the too vivid memories. But there was one difficulty Wanderer didn't expect: the former tenant of her body refusing to relinquish possession of her mind. Melanie fills Wanderer's thoughts with visions of the man Melanie loves--Jared, a human who still lives in hiding. Unable to separate herself from her body's desires, Wanderer yearns for a man she's never met. As outside forces make Wanderer and Melanie unwilling allies, they set off to search for the man they both love.
If you liked The Host, here are some other titles you might enjoy:

Birthmarked by Caragh M. O'Brien
In a future world baked dry by the sun and divided into those who live inside the wall and those who live outside it, sixteen-year-old midwife Gaia Stone is forced into a difficult choice when her parents are arrested and taken into the city.

City of Bones by Cassandra Clare
Suddenly able to see demons and the Darkhunters who are dedicated to returning them to their own dimension, fifteen-year-old Clary Fray is drawn into this bizarre world when her mother disappears and Clary herself is almost killed by a monster.

The Compound by S.A. Bodeen
After his parents, two sisters, and he have spent six years in a vast underground compound built by his wealthy father to protect them from a nuclear holocaust, fifteen-year-old Eli, whose twin brother and grandmother were left behind, discovers that his father has perpetrated a monstrous hoax on them all.

Dancing With An Alien by Mary Logue
A teenage boy from outer space travels to earth on a mission to help save his planet, and ultimately he falls in love, causing his mission to fail.

The Dangerous Days of Daniel X by James Patterson
Fifteen-year-old Daniel has followed in his parents' footsteps as the Alien Hunter, exterminating beings on The List of Alien Outlaws on Terra Firma, but when he faces his first of the top ten outlaws, the very existence Earth and another planet are at stake.

Divergent by Veronica Roth
In a future Chicago, sixteen-year-old Beatrice Prior must choose among five predetermined factions to define her identity for the rest of her life, a decision made more difficult when she discovers that she is an anomaly who does not fit into any one group, and that the society she lives in is not perfect after all.

Enclave by Ann Aguirre
In a post-apocalyptic future, fifteen-year-old Deuce, a loyal Huntress, brings back meat while avoiding the Freaks outside her enclave, but when she is partnered with the mysterious outsider, Fade, she begins to see that the strict ways of the elders may be wrong--and dangerous.