A museum trip is on the school day agenda, which makes Karl feel hesitant.
He likes old artefacts, rusty gadgets and dim corners... But in a museum, objects are placed into display cabinets where they mustn't be touched!
Museums also have paintings, and history. However, Karl is far more intrigued by vampires, witches and spectres.
But this museum trip is a bit special! That's thanks to the mysterious man in a stylish suit and a fine top hat, following Karl around.
Why doesn't anybody else seem to see this ghostly gentleman?