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Baron von Thunder-ten-tronckh raises young Candide in Westphalia alongside his daughter Cunegonde. The tutor Pangloss teaches that this is the best of all possible worlds, where everything serves an ultimate purpose. Trouble begins when Candide kisses Cunegonde behind a screen, prompting the Baron to kick Candide out of the castle with swift violence.
Wandering hungry and freezing, Candide is tricked into joining the Bulgarian army by recruiters who praise his height. Military discipline proves brutal, subjecting him to thirty-six lashes across a gauntlet of soldiers for taking a simple walk. He narrowly escapes execution when the Bulgarian King passes by and pardons his naive ignorance.
A horrific battle between the Bulgarians and Abares leaves thousands dead in a display of senseless slaughter. Candide hides among corpses before escaping into Holland, where religious hypocrites refuse him aid because he cannot confirm the Pope is Antichrist. Only James, an honest Anabaptist, shows genuine charity by feeding and employing him.
Candide encounters a diseased beggar who reveals himself as Pangloss, now rotting from syphilis contracted from Paquette. Pangloss insists his illness is necessary for the greater good, as trade brought chocolate alongside the disease. He reports that the Baron's castle was destroyed and Cunegonde butchered, yet maintains all is well.
Sailing toward Lisbon, Candide, Pangloss, and James encounter a violent storm that destroys their ship. James drowns while saving a cruel sailor who refuses to aid him in return. Upon reaching shore, a massive earthquake strikes Lisbon, destroying the city while Pangloss stubbornly insists the event is part of a perfect divine design.
Authorities in Lisbon host a public execution to avert future earthquakes through religious sacrifice. Pangloss is hanged for his philosophical arguments, while Candide is severely flogged for listening attentively. An old woman approaches Candide in the aftermath, offering to tend his wounds and lead him to safety.
The mysterious old woman treats Candide's injuries with ointment and brings him to a secluded house. There she reveals Cunegonde, alive and hidden from public view. The tearful reunion leaves Candide bewildered, as he had believed her dead based on Pangloss's earlier account.
Cunegonde recounts surviving the attack on her father's castle after being wounded by a soldier. Sold to a Jewish banker named Don Issachar, she was later spotted by the Grand Inquisitor, who demanded a share of her favors. The two men agreed to split her week, leaving her captive in Lisbon during the earthquake.
Don Issachar arrives unexpectedly to claim his night with Cunegonde and draws a dagger on Candide. Candide instantly stabs the banker to death, followed shortly by the Grand Inquisitor who walks in soon after. Realizing they must flee execution, Candide, Cunegonde, and the old woman ride south toward Cadiz.
Arriving at Cadiz in total poverty after a robbery, Candide demonstrates military drill maneuvers to impress Spanish officers. He receives command of a company heading to Paraguay to suppress a native rebellion against the Jesuits. As they set sail across the Atlantic, the old woman hints at a past far more tragic than Cunegonde's.
The old woman reveals she was born a princess, daughter of a Pope and a duchess. Her youth of luxury dissolved when her fiancé was poisoned and pirates captured her ship to sell her into slavery. Through years of horrific war and siege across North Africa, she endured unimaginable horrors, including the loss of half her buttocks during a famine.
Her ordeal continued as plague wiped out her captors, sending her through Russia and Germany as a servant. Despite enduring physical mutilation and utter misery, she observed that human beings cling fiercely to life regardless of suffering. Her tale convinces Cunegonde that suffering is universal rather than extraordinary.
Landing in Buenos Aires, the travelers meet the arrogant governor Don Fernando, who immediately courts Cunegonde. A Spanish magistrate arrives pursuing the murderer of the Grand Inquisitor, tracking Candide's trail from Cadiz. The old woman advises Cunegonde to marry the wealthy governor while urging Candide to flee instantly.
Accompanied by his resourceful servant Cacambo, Candide flees to the Jesuit territory of Paraguay. They discover the commander of the local Jesuit guard is none other than Cunegonde's brother, who survived the castle massacre. The reunited friends embrace warmly, marveling at the strange twists of fortune.
Joy quickly turns to rage when Candide announces his intention to marry Cunegonde. The Baron's brother refuses to allow a commoner without seventy-one quarterings of nobility to marry his sister. Outraged by this aristocratic arrogance, Candide draws his sword and strikes the brother down in a sudden brawl.
Escaping in Jesuit disguises, Candide and Cacambo enter the wilderness and encounter the Oreillons tribe. The natives capture them, preparing to cook and eat them under the assumption that they are Jesuit oppressors. Cacambo convinces the tribe to spare them by proving Candide actually killed a Jesuit officer.
Abandoning their carriage in a river, the travelers drift into a hidden valley called Eldorado. They find children playing in the streets with gold and emeralds as though they were worthless pebbles. When they try to pay for a lavish meal with this street gold, the hosts laugh and refuse payment.
Eldorado features no court systems, prisons, or religious persecution, as all citizens naturally give thanks to a single deity. The King warmly receives Candide and explains that their peaceful society survives by remaining entirely isolated from the outside world. Desiring to retrieve Cunegonde, Candide decides to leave, taking a fortune in gold-laden sheep with him.
Crossing back into Spanish territory, Candide loses most of his treasure and meets a mutilated slave who explains the human cost of European sugar production. Broken-hearted by this cruelty, Candide sends Cacambo to buy Cunegonde while hiring a pessimistic scholar named Martin to accompany him to Europe.
During their Atlantic voyage, Martin argues that God has abandoned the world to an evil principle, leaving humanity to prey upon itself. They witness a merchant ship sink, drowning a Dutch captain who had recently cheated Candide out of his wealth. One of Candide's golden sheep swims to safety from the wreck, giving him a fleeting moment of hope.
Approaching the coast of France, Martin maintains that human nature is innately corrupt and unchangeable. He compares men to hawks, driven by fixed instinct toward violence and deceit rather than virtue. Candide struggles to defend Pangloss's optimism against Martin's relentless evidence of human malice.
Arriving in Paris, Candide falls ill and is swarmed by opportunistic doctors, gamblers, and critics seeking his money. A deceptive abbé tricks him with fake letters into believing Cunegonde is sick in Paris, scamming him out of valuable gems. They barely escape arrest by bribing an officer to help them board a boat bound for England.
Upon arriving in Portsmouth, Candide witnesses the execution of an admiral shot by firing squad for failing to kill enough enemies. The onlookers calmly explain that in England it is deemed necessary to execute an admiral from time to time to encourage the others. Horrified by this brutal social logic, Candide refuses to set foot on English soil and pays for immediate passage to Venice.
In Venice, Candide bets Martin that a smiling young couple walking by must be truly happy. Upon questioning them, they discover the woman is Paquette, living as a desperate prostitute, and the man is Friar Giroflée, trapped in a miserable monastic life he hates. Martin wins the bet, demonstrating that apparent cheerfulness masks deep human misery.
A satirical journey exposing the folly of philosophical optimism through relentless absurdity and catastrophe.