[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/Plot-to-assassinate-gihren_2068.jpg]][[caption-width-right:300:Top to bottom: [[BiggerBad Gihren Zabi]], [[ObstructiveBureaucrat Cecilia Irene]], [[ChildhoodFriendRomance Elise Anne Finnegan]], [[HandicappedBadass Lance Garfield]], [[DetectivePatsy Leopold Fiesler]], [[TheBrigadier Henri Schlesser]]]]
->''"The crown is fallen from our head: woe unto us, that we have sinned! For this our heart is faint; for these things our eyes are dim. Because of the mountain of Zion, which is desolate, the foxes walk upon it."''
-->--''[[Literature/TheBible Lamentations 5:16-18]]''.

Set during ''MobileSuitGundam'''s One Year War, ''The Plot to Assassinate Gihren'' (''Kidou Senshi Gundam Giren Ansatsu Keikaku'') is a manga that ran from October 2007 to March 2010. Based on the RealLife Operation: Valkyrie, and the television film, ''The Plot to Kill Hitler'', the manga details life on the [[TheEmpire Principality of Zeon]]'s homefront during the final days of the OYW.

The story begins with military washout and police detective Leopold Fieseler of the Public Safety Department investigating a series of attacks on high-ranking public officials. When Leopold's friend Elise Anne Finnegan stumbles onto a computer transmitter linking the bombings to a far larger plot to kill Commander-in-Chief [[TheEvilPrince Gihren Zabi]] and come to a peace with TheFederation, the race is on to unmask the members of the gang (dubbed Valkyrie), including their leader, the mysterious Reginlief. As Leopold becomes more and more enmeshed in the underbelly of Zeonic politics however, he finds more questions than answers.
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* {{AntiHero}}: Leopold and his allies.
* {{AntiVillain}}: Most of the conspirators simply want an end to the war with TheFederation, and the return of some freedoms to the population. How much they're actually villains is up to interpretation.
* BadassArmy: Zeon's Capital Defense Division, which pretends to be a joke. The Royal Guard would be another example.
* BadassBoast: "We will show you the essence of within colony combat." [[spoiler:Boy do they ever]].
* BigBad: Depending on how you want to look at it either Reginlief (who heads the conspiracy against Gihren) or Cecilia Irene (who heads his supporters). [[spoiler: They're eventually revealed to be one and the same]].
** BiggerBad: Gihren himself, who never appears in-story, but whose presence hangs over the entire manga like a cloud. Kycilia also qualifies, though to a lesser degree.
* [[spoiler: DatingCatwoman : Elise is part of Valkyrie]]
* CombatPragmatist: Henri-Freaking-Schlesser. When the long awaiting uprising takes place, it makes the AttackAttackAttack of most Zeon Commanders seem extra moronic in comparison. A few examples include [[spoiler:Launching the Mobile Suit attack earlier than the Royal Guard expected, using mechanized infantry to disable as many enemy mecha as possible with rocket launchers before withdrawing, using Magella Attack tanks as improvised artillery with airburst shells to scramble the sensors of the EliteMooks ''without'' damaging the colony, and finally, altering the colony's weather to -40, with the Capital Defense Division prepared with "obsolete" winter equipment deemed useless after the retreat from Earth.]]
* CurbStompBattle: The Capital Defense Division, A.K.A. the Shield of Zeon, [[spoiler: obliterates Zum City's defenses despite a 2:1 numerical disadvantage in Mobile Suits and the ''entire'' Gihren loyalist garrison fighting against them with ''minimal'' civilian casualties. Ultimately, the battle ends before Cecilia can commit her reserves. And unlike the Operation Valkyrie in World War II, this operation succeeds in its political objectives, though many of the plotters die.]]
* DesignatedHero: Leo and he isn't amused by that idea.
* EarnYourHappyEnding: After all that happens to both on Leopold and Elise involving the conspiracy, they are revealed [[spoiler:in the epilogue to have not only earned a decent place in the post-Zabi government, but also live long enough to witness Char's Neo-Zeon rise to power. They also become lovers. Not only that, operation Valkyrie is mostly successful in resulting in a peaceful transition of power from Zabi fanatics to a much more sane civilian Republic.]]
* EndOfAnAge: There's something of this feel to it, as the Zabi family's rule comes to an end.
* EveryoneIsASuspect: Leopold's investigation leads him to suspect Henri Schlesser, Lance Garfield, Cecilia Irene, Elise Anne Finnegan, and his own grandfather, among others, as various points. He also suspects that the conspiracy extends throughout the police force and the military, meaning that quite literally ''everybody'' is a suspect until proven otherwise.
** EverybodyDidIt: Not quite, but by the end, almost everyone Leopold randomly suspects of having been involved in the plot, is indeed, involved in the plot--often while being unaware of one another's roles. This includes [[spoiler:most named characters who are not Leopold himself]].
* FalseFlagOperation: [[spoiler:Valkyrie in its entirety turns out to be one of these.]]
* ForegoneConclusion: Anyone familiar with the original show knows that the conspirators won't get Gihren since he has to make it to A Baoa Qu to [[spoiler:murder his father and be killed by his sister]].
* GambitPileup: With [[spoiler: Leopolds grandpa]] as winner.
* GenreShift: Thriller or mecha action?
* GoneHorriblyRight: [[spoiler:Cecilia and Gihren concocted the plot to draw his political enemies out into the open. Thanks to some highly-placed double agents, the conspiracy ends up going a little too well for Cecilia's liking, resulting in the near total loss of the capital by the time that news of Gihren's death arrives from the front]].
* {{Irony}}: Gihren [[spoiler:tries to frame his sister Kycilia for trying to murder him. Guess who kills him in the penultimate episode of ''MSG'']].
* HeroOfAnotherStory: Ever wonder why Zeon's transition from fanatical war footing to relative peace with the Federation went so smoothly?
* HeroAntagonist: The Valkyrie plotters are noticeably making a lot of sense, enough to [[spoiler: convince Leopold to finally break his loyalty to the state.]]
* LetsFightLikeGentlemen: There are elements of this in the final confrontation between [[spoiler:Lance Garfield]] and Filius Stream.
* ANaziByAnyOtherName: All of Zeon is this to one degree or another, with the state representing a cross between NaziGermany and ImperialJapan. Gihren's loyalists take it to greater extremes than others.
* ObfuscatingStupidity: Henri Schlesser's Capital Defence Divison, which pretends to be a weak unit composed entirely of crippled veterans. In reality they're the match of nearly any unit in the Principality.
* TheOmniscientCouncilOfVagueness: Project Valkyrie, taking a cue from NeonGenesisEvangelion.
* PraetorianGuard: The Royal Guard, and in particular, Gihren Zabi's personal branch of it play a fairly major role in the story.
* PuttingOnTheReich: All of Zeon does this, and the Royal Guard more than most.
* RecursiveCanon: In Investigation Report.14 Reinhard A, Leopold goes to a shop that sells model kits, such as those for MS-O6J Zaku II Ground Types, Dozle Zabi'sa personal MS-06F (currently selling like pancakes in-universe for Dozle's memorial service post-Solomon), DFA-03 Dopps, Gaw atmospheric carriers, and dolls of various characters, Ramba Ral included. Approaches TakeThat territory due to not only the MerchandiseDriven nature of the series, but to those who [[RootingForTheEmpire root for Zeon]], because Leopold asks for an MS-05 Zaku I equipped with gas grenades, which were infamous for the One Week Battle.
* RecycledInSpace: Operation: Valkyrie with mecha!
* RedHerring: Everywhere.
* ShaggyDogStory: Subverted. We know from the start that the conspiracy won't kill Gihren. However, [[spoiler:it does force a change in Zeon's government and helps to end the war after Gihren and Kycilia are both dead.]]
* TwistEnding: [[spoiler:The entire plot was a fakeout by Gihren and Cecilia Irene, meant to frame his sister Kycilia and give him an excuse to crack down on his political rivals]].
* WeatherControlMachine: Used as very useful weapon.
* WhereAreTheyNowEpilogue
* WholePlotReference: To ''The Plot to Kill Hitler''.
* YourTerroristsAreOurFreedomFighters: Deliberately invoked. What's this? Zeon soldiers and high command disgusted with Gihren's fascist rhetoric? Extra precautions taken to ''avoid'' massive civilian casualties during an armed revolt? A targeted bombing campaign that doesn't result in massive infrastructural damage? Wanting to return Zeon to the high ideals of Zeon Zum Deikun? Someone give these guys a Nobel Peace Prize.