This book is on pre-order until book delivery arrives. 
 
Marginally Yours (Mortals & Muses #1) by Layla Nox:
 
Devon's predictable life holds one secret becoming an author. That dream comes alive when he meets Callie, the captivating new bookseller whose recommendations come with a twist. The mysterious annotations in the margins awaken his long-dormant creativity, and he can't stop coming back for more - more books and more time with her. As the lines between inspiration and devotion blur, Devon uncovers Callie's impossible truth, a secret that defies logic and threatens to tear them apart. To keep the woman who reignited his soul, he must challenge ancient forces and risk everything they both hold dear, including each other.