In Between — Kate Wilhelm

Sam and Lori had only just met and now they are dead, the result of a car accident. Accident? No. Dead? Not exactly. In life, Sam was a successful playwright, Lori a secretary for Ben Carnahan, a scheming movie producer who wants Sam's new script and whose negligence on a movie set twenty years earlier killed Lori's father. Now Sam and Lori are ghosts out of sequence with the real world yet fully aware of their existence. As they work together to find out what happened to them, a plot to murder Ben is revealed. As ghosts, how can they possibly stop this conspiracy? They can't contact the living, for rules are rules - in life and in death and even when you're in between.