This is a story from the "Great Ghost Stories" collection.
Detroit homicide detective Russ Baker has been sent to work the Cold Case Division due to a screwup he committed on a case. He was all alone in the basement office until he was visited by an unlikely partner. A dead former detective who was now an annoying ghost. Would the ghost help him solve the cold cases, allowing the murdered victims to go on to the hereafter?
"Don't waste your money!"