The Ghost Files (The Ghost Files (Book 1) by Apryl Baker
Normally, she just ignores the ghosts and they go away. That is until she see's the ghost of her foster sister... Sally.
Everyone thinks Sally's just another runaway, but Mattie knows the truth--she's dead. Murdered. Mattie feels like she has to help Sally, but she can't do it alone. Against her better judgment, she teams up with a young policeman, Officer Dan, and together they set out to discover the real truth behind Sally's disappearance.
Only to find out she's dealing with a much bigger problem, a serial killer, and she may be the next victim...
Will Mattie be able to find out the truth before the killer finds her?