Chapter 12 - "The Polyjuice Potion" - In which Harry is hauled before Dumbledore, witnesses the phoenix burning, and learns Dumbledore does not suspect him of wrongdoing. Christmas Day, presents are opened, the Polyjuice Potion is ready, Crabbe and Goyle are drugged and hair stolen and the potion drunk by HRH. Disguised as Crabbe and Goyle, Ron and Harry quiz Draco Malfoy and find he has nothing to do with the Chamber of Secrets. Upon returning to the girls' bathroom they find Hermione has taken on cat features.
The Polyjuice Potion Plot Continues
Following the plan perfectly during [Potions] class, [Harry] heaves a [firecracker] into [Goyle]'s [cauldron] while [Hermione] nips into [Snape]'s office to steal the ingredients needed for [Polyjuice Potion]. [Snape] is irate, but does not directly accuse [Harry], and the trio successfully adds the ingredients after class.
One morning in the [entrance hall], an announcement appears for a [Dueling Club] - so [Harry], [Ron], and [Hermione] sign up.
[Gilderoy Lockhart] starts the first [Dueling Club] meeting with a demonstration, where he makes a fool of himself demonstrating with [Snape]. They soon have the students divide into pairs to practice.
With [Dueling Club] members paired up, [Lockhart] has them begin, but the students ([Harry] and [Malfoy] included) attack with much more than the requested [Disarming Charms].
[Snape] suggests [Harry] and [Draco] model how to block spells. [Lockhart]'s demonstration fails but he sets them at it anyway, and [Draco], at [Snape]'s suggestion, launches a [snake] at [Harry], a situation exacerbated when [Lockhart] launches it into the air. When the [snake] slithers toward [Justin Finch-Fletchley], [Harry] yells at it to stop, but doesn't understand when [Ron] and [Hermione] promptly drag him from the room.
More Suspicions and Worries
[Ron] and [Hermione] confront [Harry] about being a [Parselmouth], and after some explaining, convey the gravity of the situation. [Harry] learns that [Salazar Slytherin] was a famous [Parselmouth], and that there have been very few since - and therefore, that he will now certainly be thought the [heir of Slytherin].
With [Herbology] cancelled, [Harry] heads around the school to look for [Justin] and explain what happened at the [Duelling Club]. He doesn't see him but finds some [Hufflepuffs] in the [library] discussing why [Harry] must be the [heir of Slytherin]. He confronts them, but with no success.
[Harry], leaving his confrontation with the [Hufflepuffs], briefly runs into [Hagrid], holding a dead [rooster], in the hall. [Hagrid] realizes something is wrong but [Harry] won't tell him what, instead heading off to [Transfiguration].
Another Basilisk Attack
Walking alone in the hallway, [Harry] accidentally discovers a [Petrified] [Nearly Headless Nick] and [Justin Finch-Fletchley] in the hall. [Peeves] soon arrives and screams for help, attracting the whole school, and [Professor McGonagall] whisks [Harry] away.