Beware Hogwarts, Demigods don't understand 'Rationality'

Miranda and Will have visited Hogwarts before. Now this year they must go again; bringing with them Percy, Annabeth, Jason. Piper, Leo, Frank, Hazel, Nico, Lou Ellen and Cecil. Posing as exchange students the demigods battle pranks, monsters, starstruck students and terrible puns as well as magic of the dark kind. But Miranda forgot something very, very important...Oops REVISED