Replacement. The Worthings, #2

To save my life, I agree to switch places with my identical twin sister. I have no other options left, and my sister simply wants to disappear. But now I'm forced to live her superficial, luxurious life and make sense of her strange and complicated relationship with William Worthing. He's wealthy and brilliant and disturbingly attractive, and now I'm living with him and pretending to be my sister.
She always kept him at arm's length, but the more I get to know him, the closer I want to get. The last thing I should do is fall for him, but I'm not sure how I can help it. Our whole relationship is built on a lie, and the life and man I desperately want will never truly belong to me.