Bad Devotion. The Hellborn Series, #6

Eight months after the murder of Hugo, Savannah is beginning to find her way as Queen of the Black Grove Clan until Sergeant Marcus Cain calls, begging for her help with a case.  A young female vampire has shown up at the police station with claims that she has been part of a cult for the last several years and within the last year has been assaulted in more than one way.  As much as Savannah wants to say no to Cain, she can't.  For her clan's safety and the safety of this female, she is pulled into more than she could have imagined.  The further she dives into this case, the more she discovers there are other forces at work who are trying to destroy her and everyone she loves.