Coven of Secrets by C. J. Beaumont

A broken witch. A missing sister. A grisly murder.

Once touched by darkness, always tainted. Roxanne Cole swore off magic for a reason. But now her little sister Kathryn has gone missing, and the only person willing to help is her pretty-boy nemesis, Ray Hammond. Roxy’s not sure she can trust him, but with nowhere else to turn, she’s forced into an uneasy alliance.
When the coven’s high priestess also goes missing, it seems her sister’s disappearance is just a small piece of a much bigger puzzle. And the more she works with Ray, the more she realizes he’s just another temptation that could add to the ever-increasing magical missing persons count.
As bodies start dropping and the death toll rises, it becomes clear someone is declaring war on the Bayshore Witches. Now, if Roxy wants her little sister back, she’ll have to decide what, and who, she’s willing to sacrifice.