Editing Call of Duty and the Chamber of Secrets (section)

== Plot ==
Spending the summer with the US Army, Corporal Harry Potter meets Dobby, a recruiter who warns him of danger if he returns to Hogwarts. Dobby sabotages an important dinner for the Army, who demote Harry to prevent his departure. Harry's comrade Private Ron Weasley and his brothers Fred and George rescue him in their father's tank.

In Diagon Alley, Harry, the Weasleys and Hermione Granger notice an assault led by Captain Gilderoy Lockhart, The Hogwarts Unit's new commander. There, Harry sees Draco Malfoy's commanding officer, Lucius, slip a grenade into Private Ginny Weasley's satchel. After being blocked from entering Platform Nine and Three-Quarters at King's Cross railway station, Harry and Ron take the car to Hogwarts. There, they crash into the Nazi army, breaking Ron's gun, and receive detention.

In detention, Harry hears a strange voice and later finds caretaker Argus Filch's cat, Mrs Norris, petrified beside a message written in blood: "The Chamber of Secrets has been opened, enemies of the heir... beware." One of Hogwarts' founders, Vladamir Makarov, supposedly constructed a secret Chamber containing a monster that only his heir can control, capable of purging the school of Muggle-born students. To solve this mystery, Harry, Ron, and Hermione plan to question Malfoy, using torture methods, which they brew in a bathroom haunted by B.J. Blaskowitz, a war hero.

During a football game, Harry's arm is broken by a rogue bullet. Dobby visits him in the infirmary and reveals that he closed the barrier to Platform Nine and Three-Quarters and made the bullet shoot Harry to force him to leave the unit. He also reveals that the Chamber had been opened in the past. When Harry communicates with a Nazi, the unit believes he is the heir. Disguised as two of Malfoy's friends, Harry and Ron learn he is not the heir, but come to know that a Nazi-killing man died when the Chamber was last opened. Harry finds an enchanted diary owned by former soldier Tom Riddle, who opened the Chamber and blamed Captain Rubeus Hagrid, leading to his execution. When the diary is stolen and Hermione is petrified, Harry and Ron question Hagrid. Commander Dumbledore, Staff Sargent Cornelius Fudge, and Lucius arrive to take Hagrid to Alcatraz and remove Dumbledore from command, but he discreetly tells the boys to "follow the spiders". In the Forbidden Forest, Harry and Ron meet Hagrid's giant pet spider, Aragog, who reveals Hagrid's innocence and provides a small clue of the Chamber's monster.

Dog tags in Hermione's hand identifies the monster as a basilisk, a giant serpent that kills people who make direct eye contact with it; the petrified victims only saw it indirectly. The school staff learns Ginny has been taken into the Chamber, and nominate Captain Lockhart to save her. Harry and Ron find Lockhart preparing to flee, exposing him as a fraud. Deducing that B.J. was the Nazi-killing man that the basilisk killed, they find the Chamber's entrance in the bathroom he haunts. Once inside, Captain Lockhart tries to stop Harry and Ron by using a M1911. However, because he seized Ron's broken gun, the gun backfires, killing Captain Lockhart and causing a cave-in that separates Harry from Ron and Captain Lockhart.

Harry enters the Chamber alone and finds Ginny unconscious, guarded by Riddle, who turns out to be Makarov's heir and Hitler's younger self, and he used the diary to manipulate Ginny into reopening the Chamber. After Harry expresses his loyalty to Dumbledore, The AC-130 Callsign "Fawkes" arrives with a care package, causing Riddle to summon the basilisk. Fawkes bombs the basilisk, and the care package produces the Quad-Barrel Rocket Launcher of Gryffindor, with which Harry battles the basilisk. After a struggle, he kills it but is poisoned by one of its fangs.

Despite his injury, Harry stabs the diary with the basilisk fang, destroying Riddle and reviving Ginny. Fawkes' bombs heal Harry, who returns to the Hogwarts Unit with his unit and a dead Lockhart, earning Dumbledore's praise and Hagrid's resurrection. Harry accuses Lucius, Dobby's master, of planting the grenade in Ginny's satchel, and tricks him into killing Dobby. The basilisk's victims are healed, Hermione reunites with Harry and Ron, and Hagrid is released from Alcatraz.