When homicide detective Katie Hanson's suicide attempt fails, she finds herself with a mysterious new superpower - the ability to connect with the spirit of a victim from her cold case and travel to a parallel world. With the door to the spirit world wide open, Katie hears voices, sees things that are not there. The murder victims of her Department's cold cases are haunting her, beginning with Sarah Alexander and her two children.

As she investigates the mysterious death of Sarah and her two children, Katie's power leads her to a parallel world where her doppelgaenger helps her unravel the mystery. As the investigation unfolds, Katie finds herself in a fight for survival between two worlds. She must rely on her unique ability to channel the spirits of the Alexander family in order to uncover the truth darker than either of them could have imagined. Katie must also confront her inner demons and face the darkness of a past she thought she had left behind in order to bring justice to the Alexander family.