Living in the Wizarding World (Harry Potter fanfic but it’s cool and interactive)

"Aah!" You grab your Charms textbook from your bag, chucking it at the man, -er, ghost.
Of course, the book passes right through him, and the poor guy looks dissapointed, and quite offended.
"How dare you attack me! I am Sir Nicholas and was treated with the utmost resect in my time! Now with all these new young people, they're throwing things at me left and right! Unbelievable..."
He trails off, beginning to drift away.
You still need a way to get to Charms.
You...