[@Blu] Okay... I think I actually have something... What would you say to this... A girl, kidnapped at a young age by a cult to be used in a dark ritual to presumably create some evil messiah... But since the cultists are idiots they messed the ritual up and the girl ended up bonded to a wraith entity. They can't be separated and they can't survive unless the wraith feeds off of human life force. So the cult still manages to insert the little girl into their propaganda, manipulating and brainwashing her into submission. She would eventually escape and/or be rescued and will start her non-stop struggle with the wraith's hunger and blood-lust for human life force. And ever since she has a soft spot for missing person cases and as such is drawn to Innsmouth.

If this fits with the setting I'll start fleshing her out.