The Ghost King. Ghost King, #1

Private investigator Jude Connor lost his life at the hands of the ruthless crime boss Harold Whitlock. Years after losing his wife Lilith to a mysterious murder, he had devoted the remains of his life to caring for his one and only daughter Cassandra. Death however, was not the end. Resurrected by the power of an ancient ring bestowed upon him by Lilith's ghost, Jude returns as a Draugr blessed by the ring of Odin.
Driven by vengeance, Jude begins enacting justice upon those responsible for his death, as his mind gradually descends into darkness. Meanwhile Lilith's restless spirit returns with plans of her own. Their daughter Cassandra, now in the custody of he Aunt Nora, wrestles with the trauma of losing her parents while preparing to finish high school alongside her friend Kirsten.  Unbeknownst to Cassandra, her mother never truly  left and terrifying experiences await her as she learns some bonds are powerful enough to survive even death.