Book 5 | Ch:27 - The Centuar and the Sneak

SPOILERS:

Harry and his classmates have their first Divination lesson with Firenze, Marietta Edgecombe tells Umbridge of the D.A.’s meeting but suffers the effects of Hermione’s jinx, Dobby warns Harry that the D.A. has been found out, and Harry denies the meetings to Fudge and Umbridge. Kingsley Shacklebolt modifies Marietta’s memory, and Dumbledore takes the blame and leaves Hogwarts.