Dead Button: Jack of Spades #3. Pulp Friction 2015: Altered States: Jack of Spades, #3

Haunted. Seduced. Betrayed. When ghost enthusiast Dr. Sabine Brusilov plucks a weathered skull from the mud and debris at the bottom of the Mississippi River, he gets more than he bargained for. The skull comes with a moody, petulant, sexy ghost who is not shy about his attraction to Sabine. Along with proof that ghosts really do exist, Sabine finds a treasure beyond compare. Love. Love is everything to long dead Barton Montoire.
He's lived for it, faced dishonor for it.killed for it. Now that he's found it again, he's willing to do whatever it takes to keep Sabine at his side for eternity. Even if that means more blood on his hands. With the darkness that circles Sabine growing stronger, and his lover's actions becoming more erratic and unpredictable, Bart is challenged to protect his love from some unknown danger. Ghosts and humans exist on two separate planes, and there's only one way for them to be together.
But betrayal lurks in the shadows.