Dark Secrets. The Black Lantern Series, #1

An arranged marriage, a missing bride, and a father with dark secrets.Hanna Kang has been an investigator for the Black Lantern Society-an organisation of witches, werewolves, and vampires who work behind the scenes to right wrongs via whatever means necessary-for nigh on three years, and has certainly done her part in bringing society's "wicked witches" to justice. So when she and her shapeshifter partner, Ginny Baker, are given the task of babysitting Monica Ashworth, the pampered only child of one of Canberra's most prominent witches, she looks forward to the change of pace.
But things go very wrong, very fast. Monica is kidnapped from under their noses, a bridesmaid is murdered, and another goes missing. As Hanna and Ginny battle to find the two women before they also end up dead, a mysterious stranger steps in to help Hanna-a man who has no life force but who appears as human as she. A man she is dangerously attracted to. With the body count mounting and the lies of all those around them beginning to unravel, it soon becomes clear that revenge, not money, is at the heart of it all.
But Monica and her father are not the only ones holding secrets. Hanna has them too. and hers can kill.