Lock by Kimberly Knight

Before Zell was born, her fate was sealed.

Held captive in a high-rise overlooking New York City since the age of twelve, she had no friends her own age, no life outside of the penthouse, and absolutely no choices of her own. But what she didn’t realize was the tower where she lost her freedom would one day become her salvation. Her prince would arrive, they would fall in love, and they would come up with a plan for her to escape so they could live happily ever after.

If only it were that easy.
Every girl dreams of her life becoming a fairy tale, even Zell, who’s knowledge of romance was simply from the books she stole from other girls at the brothel.
In a world where sex, drugs, and manipulation is solely the life she knows, the only fairy tale poor Zell would endure would be a sinister one …

Because freedom always comes at a price.