Rookie detective Dana Cauldwell is handed a cold case no one cares to solve: a string of "mercy killings" across the city. Her job is clear-reopen the wounds of the grieving families and hunt down the "Doctor" behind the needle. But as Dana digs into the investigation, her own life begins to fracture. Between a fellow officer determined to put her in her place and her mother's questionable health, the line between the law and morality starts to blur. Every interview reveals a devastating truth, behind every crime is an act of compassion. Now, Dana must decide if she's hunting a serial killer or a man doing God's work.