Twisted Lies (Book 4 of 4) by Ana Huang

Book 4 of this series (final book)

Charming, deadly and smart enough to hide it. Christian Harper is a monster dressed in the perfectly tailored suits of a gentleman.

He has little use for morals and even less use for love, but he can't deny the strange pull he feels toward the woman living  just one floor below him.

She's the object of his darkest desires, the only puzzle he can't solve. And when the opportunity to get closer to her arises, he breaks his own rules to offer her a deal she can't refuse.

Every monster has their weakness. She's his. His obsession. His addiction. His only exception.