Sholly Fish's story in Scooby-Doo isn't really funny. He offers rock solid characterization for the Gang and his returning Ghastlies. He conceives of a classic Shaggy and Scooby comeuppance for the ghost.
The mystery is in where Fish's story really excels. It's a fairplay all-ages drama. Fish introduces the suspects. He gives the reader the clues, and Pope in turn séances a decent and periodic faux ghost for the Gang to unmask. The message at the end of the story doesn't come off as forced but genuinely sweet.