Bound By Fire and Lies by Jaime Rush

Miami is under attack by the hidden world of magic, but one woman can save it. The problem is, Ruby Salazaar doesn’t believe in magic, doesn’t know she has powers, and, oh, she thinks the only man who can help her is the bad guy.

Ruby wants answers…and revenge. Her uncle has just been murdered before her eyes and the name he utters with his final breath—Cyntag—leads her into a world beyond her wildest imaginings. She soon learns that the dark, sexy Cyntag Valeron knows more about her than she does herself.
Ruby changed Cyn’s life before she even knew who he was. Now she charges into his life, a beautiful woman full of fire and questions. Cyn knew this day would come, but he couldn’t foresee the danger—and desires—Ruby would bring with her.

He can teach her how to harness her newly awakened powers, but what about the one force neither can control?