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''Halo: The Flood'' is the second ''{{Franchise/Halo}}'' book, and was written by William C. Dietz in 2003. It is a novelization of ''VideoGame/HaloCombatEvolved'' which goes into detail about not just the Master Chief's escapades during the original game, but those of his fellow humans (including the [[Literature/HaloTheFallOfReach ODSTs]]) and [[PerspectiveFlip the Covenant]] as well.

The book got an UpdatedRerelease in 2010, with several small details changed to make it mesh better with later canon.

Not to be confused with TheGreatFlood, although [[RuleOfSymbolism the allusion is intentional]].
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!!Tropes used in the novel:

* AdaptationExpansion:
** Ever wonder what the Marines were up to during the game? Now you know. Most of their time is spent recovering supplies and vehicles back from the Pillar of Autumn in large battles, taking prisoners, and trying to find another way offworld.
** The Elite (or one of the Elites) who ambushes you during "The Maw" was obsessed with killing you the entire time.
** Now you know how Keyes got captured by the Covenant and why [[spoiler:his bridge crew from ''The Fall of Reach'' is completely absent after the first level]].
* AndIMustScream: If you thought [[spoiler:Jenkins' and Keyes']] fates were bad, wait until they're given detail here. [[spoiler:The Infection Form that got Jenkins was starved too long and didn't completely consume Jenkins' mind, leaving him free to witness himself killing and mutating and feeling the pain he takes from the mutations and gunfire, and Keyes has his memories - eventually his very personality - torn from him as the Proto-Gravemind tries to find Earth.]]
* AFatherToHisMen: Major Silva and Captain Keyes.
* AGlassOfChianti: Major Silva jokes about the [=ODSTs=] not getting the wine in the officers' escape pods. Turns out, they actually have wine in them (Keyes is about to get some before noticing a cloaked Elite trying to kill him).
* BadassNormal: Sergeant Marvin Mobuto, who was Spark's ''first'' attempt to get someone to get through the Library. He managed to make it pretty far in before getting killed, and he wasn't a Spartan super-soldier, just a regular guy. The Chief makes it a point to show his respects to this soldier who he never met, precisely because he was able to survive that long in the Library.
* BittersweetEnding: To Wallace Jenkins' story; he's finally able to receive [[spoiler: a MercyKill from McKay and dies thanking her.]]
* ButtMonkey: ''Yayap''. A Grunt who had the misfortune of encountering and surviving John, gets shackled with an overzealous idiot Elite, is beaten up and taken prisoner, and gets [[spoiler:front-row seats to Halo exploding]]. And, of course, the Grunts as a whole.
* ContrivedCoincidence: Out of all the Flood forms McKay could have chosen to take prisoner, she decides to take the one inhabited by a half-living human desperately wanting to die. Similarly, the novel goes into great detail into ''why'' [[spoiler:Jenkins]] kept some form of his mind after being assimilated - the Flood Infection form that hijacked him was too starved to make a complete override.
* DisproportionateRetribution: At one point, Ensign Dowski decides suggesting to Keyes to surrender to the Covenant, while being really insubordinate about it. Granted, this is one of the stupidest things anyone has said in Halo, but it's followed by Keyes ''tying her up and leaving her to be killed by the Covenant.''
* DoomedByCanon[=/=]DownerEnding: As anyone who played through ''Combat Evolved'' would already know, [[spoiler:the UNSC subplot ends with nearly all the humans dying on Halo; when Silva deciding to bring a Flood-infested ship directly to Earth, [=McKay=] realizes that the Flood infection risk is far too great and chooses to sever the ship's controls instead, killing all hands on board]].
* FantasticRacism: Jackals hate Grunts, and abuse them at every opportunity.
* FatalFamilyPhoto: Played straight with Sam Marcus's picture of his wife. He doesn't even make it past the prologue.
* FictionalDocument: The 2010 rerelease to celebrate the launch of ''VideoGame/HaloReach'' includes a series of documents and transcriptions further expanding on the EU.
* FunetikAksent: The Stealth Elite following the evacuating ''Pillar of Autumn'''s bridge crew has no idea who this "Keezz" person is, but he sounds important. He winds up getting headshot by "Keezz", who is, you guessed it, Keyes.
* GenderBender: An ODST called Parker accompanies John on his mission to rescue Captain Keyes; they change from a he to a she between scenes. This was fixed in the 2010 edition, in which Parker is a male throughout.
* GloryHound: Major Silva very much wants glory for himself and his [=ODSTs=]. This ends up [[spoiler:nearly getting the entire human race infected with the Flood when Silva tries to bring home a Covenant ship with Flood still on it, all just to gain himself and the [=ODSTs=] recognition and awards]].
* HeroicAlbino: Not exactly, but when [=McKay=] accompanies John-117 to Major Silva, she notes how pale the Chief is from all the time spent in the suit.
* MajorlyAwesome: Silva is well respected amongst the [=ODSTs=] and is considered AFatherToHisMen.
* OneSteveLimit: Averted with Ellen Dowski, the [[TooDumbToLive idiot who tries surrendering to the covenant]], and Ellen Marcus, Sam's wife. Given that the former is dead before the halfway point and that the latter is TheGhost never mentioned after the prologue, it's not too noticeable.
* TheOnlyOneAllowedToDefeatYou: Zuka 'Zamamee, a Special Ops Elite who survived an encounter with John, tries his damndest to get approval to pursue and kill "the Demon". [[UnknownRival Not that John knows.]]
* ProudWarriorRaceGuy:
** '''Zuka 'Zamamee'''. Even more so than other Elites (who are a race full of them). Even his superiors tell him to knock it off at times.
** The [=ODSTs=], especially Major Silva, who hates John for [[Literature/HaloTheFallOfReach killing four of his best men a few years back.]]
** Tellingly, this status gets both Zuka and Silva [[spoiler:killed. 'Zamamee spends most of the plot trying to kill John, but ends up being fragged by the Chief without much of a fight. For his part, Major Silva nearly dooms the entire human race by attempting to bring a captured Flood-infected Covenant ship directly back to Earth in breach of the Cole Protocol, all just because he believed it'd bring him and the survivors (especially the [=ODSTs=]) fame and glory (a Covenant ship had never been captured before, and he believed it'd bring him and the survivors); if [=McKay=] hadn't stopped him, either the Covenant would have tracked them back to Earth, or the Flood would been well on their way to consuming the entire galaxy]].
* QuintessentialBritishGentleman: Wellsey, the other AI aboard the ''Pillar of Autumn''. Actually pretends to be the Duke of Wellington, down to his appearance, mannerisms, and insisting that he was there at his actual victories, which annoys his acquaintances.
* RememberTheNewGuy: Applies to most of the cast, barring the Master Chief, Cortana, Keyes, Foehammer, Johnson's squad, the two techs from the first level, and the bridge crew members who had previously appeared in ''The Fall of Reach''. That said, most of the newcomers either have all their scenes taking place in the offscreen portions of ''Combat Evolved'', or are simply fill-ins for already existing Marine and Covenant [=NPCs=], though the fill-in characters' actions don't always correspond with those of their in-game counterparts. However, there are still some glaringly straight examples:
** Though it's logical that the new Covenant and Marine characters wouldn't have had much, if any, chance to directly interact with Keyes in ''The Fall of Reach'', the same cannot be said for bridge crew members Ellen Dowski and Gail Purdy, who were not mentioned at all in ''The Fall of Reach''.
** Wellsley is a strange case; ''The Fall of Reach'' mentioned offhand that the ''Pillar of Autumn'' had two [=AIs=] assigned to it, but ''The Flood'' depicts him as escaping to Halo's surface with the ship's ODST contingent, even though ''Combat Evolved'' makes no mention of a second UNSC AI working with Cortana.
** The book claims that some of the Marine [=NPCs=] Chief fights alongside are actually [=ODSTs=], though the game itself makes no mention of this. This was probably because ''Combat Evolved'' came out back when Bungie themselves weren't planning on ever putting [=ODSTs=] into the games.
** Zuka 'Zumamee is a Spec-Ops Elite, an enemy type which only shows up in the final three levels of the original game. However, the book has him already fighting the Chief in the very first level.
** Finally, the book indicates about ''300'' humans were still alive when the Chief set off to destroy Halo, in contrast to ''Combat Evolved'' implying that almost all of the remaining UNSC soldiers had already died by that point (since there was no mention of any humans surviving the Flood outbreak except Foehammer).
* {{Retcon}}:
** One of the Elites makes an exception to the Covenants' refusal to absolutely use human weapons by snapping up a pistol and [[spoiler:executing Hikowa.]] Though said Elite immediately threw away the pistol after firing that one bullet because his finger was too large to fit comfortably in the trigger guard, contemptibly declaring it 'primitive'.
** More importantly, the 2010 rerelease changes a number of details to make the book mesh better with later canon, as well as to simply fix internal inconsistencies.
* RewardedAsATraitorDeserves: The naive Ellen Dowski insists that the ''Autumn''[='s=] bridge crew surrender to the Covenant and receive mercy rather than keep fighting and all be killed. When they abandon her so only she alone can surrender, [[spoiler:she deliberately leaks their location to the Covenant when interrogated to prove she's right. However, after capturing the rest of the bridge crew the Elite in charge systematically kills them off. Ellen protests about this in shock, only for the Elite to kill her too.]]
* ScrewThisImOuttaHere: Yayap, after failing to talk Zuka out of his suicidal quest to kill "the demon" (John), finally gives up and steals a Ghost to find a way off Halo. [[spoiler:Unfortunately, he gets first-row seats to the ''Pillar of Autumn'' detonating and blowing up Halo.]]
* SuddenDownerEnding: [=McKay=], Silva, and hundreds of other marines manage to take over the ''Truth and Reconciliation'', and are about to leave Halo... [[spoiler: when Silva firmly grasps the IdiotBall to force the ending to be an IdiotPlot; he decides he wants to take Flood samples with him, despite the warnings of Wellsley and [=McKay=]. Even worse, he doesn't plan on containing them before taking off, being convinced that his people can save that part for afterwards. Instead of either continuing to try and talk Silva down, or even assassinate him and hope (perhaps vainly) that saner minds prevail, [=McKay=] blows up the entire ship, killing everybody on board. This is probably because they were all DoomedByCanon anyways]]. The sad thing is, [[spoiler:even if Silva had ordered a full decontamination before takeoff, this trope might have still applied anyways, given that they had almost no time left before the ''Autumn'' blew up and took Halo with it]].
* SuddenSequelDeathSyndrome: Keyes' [[spoiler:handpicked bridge crew]] from ''Literature/HaloTheFallOfReach'' are unceremoniously shot in the face when a Covenant dropship gets the drop on their crashed lifepod.
* TooDumbToLive: Dowski, who asks if they can surrender to the Covenant. Keep in mind that the events of this book take place near the very end of the Human-Covenant War, and the Covenant have shown themselves to be ''very'' eager to burn planets to glass for simply having a few humans on them. Twenty-seven years of knowing that this is the genocidal, single-minded foe that humanity faces... and she suggests ''surrender.'' This would be equal to an ice cube asking to surrender to the sun.
* UncertainDoom: Like the game, the book ends [[spoiler:with John and Cortana not being able to find any other survivors of Halo's destruction; the answer to whether these other survivors even exist is only revealed in ''Literature/HaloFirstStrike'']].
* UnknownRival: Zuka 'Zamamee to John, who is the nameless elite (or one of them) you kill during The Maw.
* WritersCannotDoMath: On the opening page, no less. Sam Marcus is mentioned as getting his first sleep cycle in 36 hours; he'd most likely be useless at his job if was given a 36 hour shift, as it is insanely long. Even worse, it's mentioned he's only managed to get three hours of sleep since the Pillar of Autumn made a slipspace jump, which was twenty days ago. He's got three hours of sleep in twenty days, yet he's only portrayed as being a bit tired instead of, y'know, ''dead''.
* ZombieApocalypse: The Flood.