The Body Double by Emily Beyda

A young woman gets plucked out of obscurity to "become" a double for a reclusive movie star in Hollywood. After being locked in her new apartment, drugged and seeing only Max, the star's right-hand man she slowly accepts her fate and becomes Rosanna - heart, body, and soul. Soon, there is nothing left of the woman she was and only the movie star she is now. Sinister and creepy in the brainwashing she goes through, the story pulls you in like a good Hitchcock movie. I would have rated it much higher but I felt the ending was a bit tame compared to the rest of the book. Thriller and lovers of old Hollywood film noir will find this a compelling read.