A young adult novel. 
The Intruder took possession of Sunshine’s body since birth. Now, seventeen years later, she is done watching from the outside while the Intruder wrecks her life. When the opportunity arises to reclaim her body, she takes it.
 
Once back in her body, Sunshine is arrested. And with her mother’s approval, sent to a mental institution where Intruders abound. Sunshine must learn who she is, take charge of her life, fight Intruders, and look sane while doing it.