It started with a letter

Danny wrote a letter to a certain ghost whose was a stickler for the rules. Letter lost, found and toyed with by his mate who didn't really know nor care if he had a mate, Danny's health on the line can two ghosts who he didn;t think cared for him save him and get his mate to realize how much of an Ass he's beeing or just fade out of existence? Rate m for language and lemons.