Chapter 13 - "Detention With Dolores" - In which Hermione stops the twins from experimenting on first-years, Ron tries to stop unknowing house-elves from taking Hermione's knitted hats, and Professor Grubbly-Plank teaches Care of Magical Creatures as there is still no sign of Hagrid. Harry serves Umbridge's detentions, in which an enchanted quill cuts lines into the back of his hand, and Ron tries out for and makes the Gryffindor team as Keeper.
An Awful Monday
Departing [Potions], [Ron] and [Hermione] begin arguing over whose side [Snape] might be on, when [Harry] suddenly yells at them for their bickering and storms off, spending lunch hour sitting at the base of the [North Tower].
[Ron] arrives to [Divination] with the news that he and [Hermione] have decided to stop arguing, but that they also think [Harry]'s treating them unfairly. Soon, however, class begins, with boring work of trying to interpret dreams, not to mention a load of homework.
[Umbridge]'s first [Defence Against the Dark Arts] class begins with silent reading, but soon [Hermione] questions the idea that the class won't be using any spells, leading to a class uproar. It finally culminates in a showdown between [Harry], who stands by his conviction that [Lord Voldemort] has returned, and Umbridge, who blatantly calls him a liar. She finally hands Harry a note for [McGonagall] and orders him out of the room.
Storming from class, [Harry] runs past [Peeves] and into [McGonagall], who brings him into her office. Upon learning of his behavior in [Umbridge]'s class, she warns Harry of what his behavior around Umbridge could cost him, and sends him away.
Sitting at dinner, [Harry] gets more and more frustrated as he hears students around the [Great Hall] gossiping about him, and finally he, [Hermione], and [Ron] walk out in frustration.
While Doing Homework in the Gryffindor Common Room
[Hermione] explains to [Harry] why student aren't believing him or [Dumbledore] as they and [Ron] walk back to the [common room] together. After venting their frustration at [Umbridge]'s hiring, they settle in to do some homework.
[Hermione] looks up from her homework and spots [Fred and George] with some first years, testing their products. She marches up to them and demands they stop, threatening to tell [Mrs. Weasley] if it continues.
On her way up to bed, [Hermione] puts out some hats she's knitted for [house-elves], in the hopes that they will find them and be set free. [Harry] and [Ron] finally give up on their homework, then, and go to bed themselves.
More Classes and Welcome Support
The second day of classes piles more work on [Harry], [Ron], and [Hermione], with both [Flitwick] and [McGonagall] giving the fifth years lectures on the importance of [O.W.L.s], and Harry and Ron spend their lunch hour in the [library] focused on work.