Charlotte, led by her worry of the disappearance of her father, crosses the border of her home, Light City, to the neighboring city of Shadow that they were all taught to fear. And that's how she met Xander Vaughn. Xander Vaughn, who's lived a mysterious life and controls the city, finds Charlotte's present bothersome and yet... electrifying. He knows she's not like them and is filled with hatred for her kind, and so, even when he finds out they're mates, he rejects her. The last thing he expected was for his rival, Stanley, the one who runs Light City, to claim her as his mate too. And now, Charlotte is no longer just in search of her father, but for more about her history, and why she's the spark in between two cities and two alphas. And now, she also has to make a choice.