Chapter 29 - "Career Advice" - In which Harry tells Ginny of his desire to talk to Sirius, receives career advice from Professor McGonagall, breaks into Umbridge's office to use her floo to talk to Sirius about his father, and Fred and George leave Hogwarts.
Harry Sees More than he Should
In [Snape]'s [Pensieve], [Harry] watches a scene unfold involving [James], [Lily], and Snape, when they were fifth years themselves. In it, James and [Sirius] decide to hex Snape for fun, and Lily rushes to stop them, but ends up storming off, infuriated at both Snape and James for their cocky attitudes - and before he knows it [Harry] is being pulled from the scene by an irate present-day Snape.
Enraged, [Snape] pulls [Harry] from his [Pensieve], orders him not to tell anyone what he's seen, and banishes him from his office, refusing to conduct any more [Occlumency] lessons.
As Easter holidays begin, [Harry] lies to [Hermione], saying that he's done with [Occlumency] because [Snape] decided such; Hermione hands Harry and [Ron] study schedules for [O.W.L.s], and Harry admits that he and [Cho] have had another fight.
Harry Desires to Speak to Sirius
[Harry] loses himself in thought, thinking about how awful his father had been to [Snape] in Snape's memory, and about how [Lily] had seemed to absolutely loathe [James].
[Ginny] runs into [Harry] in the [library], and hands him a chocolate Easter egg sent by [Molly Weasley]. They also talk for a bit about Harry's desire to talk to [Sirius] - and Ginny starts thinking about how it might be possible - when [Madam Pince] boots them from the library for eating.
The fifth years find themselves having to think about choosing a career path - and for a bit, [Harry], [Ron], and [Hermione] discuss their choises in the [common room]. They are interrupted, though, by [Fred and George], who along with Harry, hatch a plan for him to talk to [Sirius], over Hermione's fierce protests.
[Harry] wakes up thinking about his plan to sneak into [Umbridge's office], and then looks out the window to see [Hagrid], re-injured, struggling back to his [hut], though he seems to be okay.
Over the course of the day, [Snape] pretends to ignore [Harry] but drops his [Potions] work on the floor for a zero, and [Hermione] constantly tries to dissuade him from breaking into [Umbridge]'s office.
Almost forgetting and consequently late, [Harry] rushes to his career appointment with [McGonagall] to find both McGonagall and [Umbridge] in [McGonagall's office]. A terribly comic scene ensues, with McGonagall eventually pledging to devote her career to Harry's dream of becoming an [Auror], and Umbridge insisting that it will never happen.