At the Scare School, Casper was hanging out with Mantha and Ra in the library but he had flown away for a second as they stood in the stacks.
"Remind me why we are here again," said Ra while leaning against a wall.
"We have a book report due next week and we have to find a book for us to at least start working on so how about you start looking for something," said Mantha as she looked through the books.
"Hey, I think I just found something," said Casper after flying out of a wall.
"There's a secret room on the other side of this wall," he said.
"Why were you going through walls and not looking for a book?" asked Mantha as she glared at him.
"It was an accident," said Casper with an expression that was a mix of fear and apologetic. Ra then pulled on a book that looked out of place, causing the bookcase to swing into the secret room.
"Alright, that's kind of cool," said Mantha who instantly forgot her anger. As they walked into the room, the door shut behind them making the room go dark with no light source.
"Guys, I don't think this is a good idea," said Ra while torches automatically lit on the walls.
"Whoa, look at that book," said Mantha while looking at a book floating over a pedestal with a blue glow to it.
"Why is a book hidden here of all places?" asked Casper. Once they were standing before the book, its pages opened all on their own.
"To those about to hear this, this is the story of the lost Ghost King who once fought for the protection of both the human world and the underworld," came a voice from the book.
"Okay, I'm really scared now," said Ra.
"Wait, there's a lost Ghost King?" asked Mantha.
"I don't know, the only Ghost King I can think of would be Kibosh," said Casper who was holding a hand to his head as it had all of a sudden started to pound with a sharp pain.