Scooby Doo Musical idea

It starts off completely normal with the gang investing some sort of haunted house or w/e, then they get into a fight or something, and then everyone except Shaggy and Scooby Doo get crushed by a chandelier and die. The rest of the musical is Shaggy having to learn to deal with grief whilst also trying to solve a ghost mystery. Plot twist: the ghosts are the rest of the Scooby gang (who would’ve guessed) and he moves on or whatever.

None of this is revealed in the trailers all the trailers make it seem like a perfectly PG normal Scooby Doo musical. It’s called “The Scooby Doo-sical”