Ghosts in Quicksilver: Book Two: Sulfur
Hunting a murderer isn’t supposed to be the job of a would-be private eye with a fake ID, but after narrowly avoiding death at Kiera's hands, Jamal Kaye doesn’t have a choice. Speaking to the dead means she has plenty of ghosts of her own, and Kiera’s fascination with her is bringing up her past more than she'd like. Finding Gurjas's runaway before Kiera does promises answers, but that's easier said and done when all she has is a knife, a cellphone, a bad temper - and, on good days, a powerful right hook.
And all of this would be so much simpler, if she didn't keep wondering why Kiera feels so familiar.