Grayson Hawthorn has vowed to return his father's vineyard to the success it once was, but he is failing. Unable to secure a loan to make some much needed repairs, Grayson fears he will let down the few employees who remain and dishonor the vow he made to his father. 
 Kira Dallaire refuses to return to her father's home, but is running out of money and options. The Queen of Very Bad Ideas, Kira has a reputation for acting first, and acting huge. She is impulsive and a free spirit, caring and philanthropic. 
 Her latest idea could be her craziest yet, to access her inheritance, she will marry a complete stranger. Or nearly complete. But if it works, she can remain independent of her father and help Grayson save his vineyard. 
 What happens when pretend stops being pretend and real feelings creep in? 
 I loved the personas each bestows upon the other. In the continued battles between the Witch and the Dragon, first impressions are not always accurate, and public opinion is easily manipulated. I love the way these two challenge each other, and at the same time support and protect however they can. The push and pull between them is so charged that as each tried to rely on tried and true coping mechanisms, they find that what worked in previous relationships fails spectacularly in this sham of a marriage (and particularly because the marriage is a sham). 
 The side characters that make up Grayson and Kira's inner circles were so easy to love. Charlotte and Walter, with their guiding, interfering (sometimes humorously), and generally watchful eyes gave a stability to the vineyard family that was warm and comforting. Jose, Virgil, Harley, and Kimberly helping out where and when they can formed a solid base in the background. And even the triangle with Grayson's brother and sister-in-law added more depth to what Kira and Grayson were maneuvering. 
 But there were also characters that were easy to loathe, even when they never actually appeared in the present day scenes. And others? I thought I didn't like one particular character, but there was redemption in the most serendipitous way possible. 
 I always look forward to a new novel from Mia. Her characters are perfectly flawed, realistically fictional, and live in a vivid world. Each story I've read from Mia is so unique, yet so connected to the values of each represented sign. I am always amazed by the way she personifies the astrological sign so that it breathes and becomes so much more than a simple description. Grayson's Vow is no exception to the exceptional stories I've come to expect from Mia and the Signs of Love series. 
 I was gifted a copy in exchange for an honest review.