Chapter 12 - "The Mirror of Erised" - In which Harry, Ron and Hermione (HRH) start searching the library for facts on Flamel, the school empties for Christmas, Ron teaches Harry wizard chess, Harry gets his father's invisibility cloak for Christmas, tries it out at night and finds the Mirror of Erised, sees his family and is cautioned by Dumbledore.
As Christmas approaches, snow covers the grounds and the castle begins turning cold. [Malfoy] makes fun of [Harry] for having to stay over Christmas, but [Harry] thinks about how excited he is not to have to return to [Privet Drive].
An Eventful Christmas
[Hagrid] walks up carrying a Christmas tree, and soon [Malfoy] arrives and starts making fun of [Ron], whose attempt at retaliation loses him [points] from [Snape]. To cheer him up, [Hagrid] invites the trio to see the beautifully decorated [Great Hall] and they tell him they've been looking for information on [Nicholas Flamel].
Frustrated by an inability to figure out the identity of [Nicholas Flamel], [Harry], [Ron], agree to keep searching the [library] over Christmas break, as [Hermione] prepares to head home.
The Christmas holidays begin and [Harry] begins learning [Wizard's Chess] from [Ron].
On Christmas morning, [Harry] awakens to presents for the first time, including his father's [Invisibility Cloak] and a sweater matching those of the rest of the [Weasley] boys.
[Harry] enjoys his first [Hogwarts] Christmas dinner and then spends the afternoon with the [Weasleys], having a snowball fight and playing [wizards' chess] before heading off to bed.
Before falling asleep, [Harry] decides to use his [Invisibility Cloak] to walk the castle, heading for the [Restricted Section] of the [library]. After almost being caught and running from [Snape] and [Filch], he accidentally discovers the [Mirror of Erised], and sees his family for the first time.
[Harry] tells [Ron] about the [Mirror of Erised] and together they decide to go visit it again. [Harry] is so anxious to return he has trouble eating and has an odd look.
[Harry] brings [Ron] to the [Mirror of Erised], but instead of seeing his family [Ron] sees himself as [Head Boy]. After [Mrs. Norris] spies them though, they run back to their [dormitory].