Unrestricted Magic - Witch Twin Chronicles, #1

Blairatrix and Belledonna Rose are twins and yet in every way possible they are polar opposites. One controls the light while the other suffers in the dark yet they couldn't be closer as sisters. Now, college students and finally away from their mother's evil clutches, they are officially free from the chains of their childhood horrors. As with these sorts of things, one can only run for so long before their past demons catch up for good.
Ambient Black is a shadow aggressor, law enforcement for the occultist world, and somehow her path crosses that of Blairatrix and Belledonna, twins with a past filled with secrets that may hold the answers that Ambient needs to solve the case of a string of murders. The only problem is that Ambient has some secrets of her own that she would rather stay buried. Too bad the dead rarely ever stay that way and have a tendency to speak rather loudly.