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.
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
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.
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.