May day : a gray witch novel
(Book)

"Ari Mason is a shunned and exiled witch. She works as a bartender and reads tarot in the park. Neither of which requires her brand of black magic. Which is how she likes it. Her powers have always left a trail of death and destruction in her wake. Now, she's on a path of altruism, and by using herbs and positivity in her spells, instead of blood, she can help those around her. As the temperature rises in Houston, so does the body count. But these aren't regular murders, someone is using magic that hasn't been seen in centuries to drain humans and witches of their life force. After one encounter, Ari realizes that any witch is fair game and sends out a call for black magic and white magic witches to unite. They must put aside old stereotypes to fight this ancient evil if any of them plans on making it through this Beltane alive." --,Back cover.