The Witches Trilogy: Chimera

Olivia's a witch who is not enjoying her fabulous life. She's got friends, polo matches, private jets... and an evil witch named Dantin with a psychotic crush on her. He hates that Olivia won't love him back and he's hell-bent on destroying everything she cares about, just to punish her. Adding to Dantin's malevolence is his familiar. It can possess and control any witch, and no one is safe until they are stopped.

But the icing on of all this? Olivia can't use her powers to fight Dantin or his familiar, or she'll turn evil herself. She'll need every bit of craft and trickery she knows to get everyone out of this alive. Because if she can't, things will get worse.