With Catilina as a declared enemy, Cicero faces a perilous consular election. Catilina is acquitted in his fixed trial, defended by the senior consul Lucius Manlius Torquatus and supported by the aristocratic elite. Cicero embarks on an unprecedented four-month campaign tour of northern Italy, hoping to win over newly enfranchised citizens. He is aided by two professional political agents, Ranunculus and Filum. During his trip, a provincial governor warns him that his campaign is doomed because the aristocracy will back Antonius Hybrida for consul.

Cicero returns to Rome and is joined by his wealthy, well-connected friend Atticus, who has just moved back from Greece. Atticus provides important political intelligence, confirming that Hybrida and Catilina are running on a joint ticket. He then delivers shocking news from a dinner party: Publius Cornelius Lentulus Sura, a disgraced ex-consul and Catilina ally, has boasted that an entire electoral slate—including consul, praetor, and tribune candidates—is being secretly financed by Marcus Crassus. Cicero realizes that his true opponent is not Catilina or Hybrida, but Crassus, who is using his immense wealth to install a government of his own choosing.

To prove that Crassus is behind the widespread bribery, Cicero instructs his agents to pose as vote-buyers. They discover that every corruptible vote in Rome has already been purchased by a single, secret client. Meanwhile, the consul Marcius Figulus introduces a strict anti-bribery law. In the Senate, Cicero cleverly amends the bill with a clause aimed directly at Crassus, making it a crime to “cause” a vote to be solicited.

Desperate for evidence, Cicero accompanies his agent to a meeting with a vote-broker named Gaius Salinator. Cicero reveals his identity and intimidates Salinator into confessing that Crassus is buying thousands of votes to install Catilina and Hybrida as consuls, Lentulus Sura as praetor, and 10 friendly tribunes, effectively purchasing the entire government. The scale of the plot is staggering, and its purpose remains a mystery. The next day, the anti-bribery bill is vetoed in the popular assembly by Mucius Orestinus, a tribune whom Cicero once defended.

That evening, a demoralized Cicero returns home to find Caelius waiting. Caelius reveals that Crassus is holding a secret strategy meeting that night. He knows of a hidden listening post in the room and suggests that Cicero’s secretary, Tiro, hide there and use his shorthand to record the conspiracy. After Cicero promises him his freedom—though not on condition of compliance—a terrified Tiro agrees to the mission.

Caelius sneaks Tiro into Crassus’s house and hides him behind the fabric, where Tiro secretly records the entire meeting between Crassus, Caesar, Catilina, Hybrida, and their allies. After Tiro returns to Cicero’s house, he and Cicero work through the night to decipher the notes, learning that after sweeping the elections, the purchased tribunes will pass a radical land reform bill. A powerful 10-man commission, led by Crassus and Caesar, will then be created to oversee the redistribution of public land in Italy and, ultimately, annex the entire kingdom of Egypt, giving them control of its vast revenues and making them the permanent masters of Rome.

Realizing the plan is a “coup d’état disguised as an agrarian reform bill” (277), Cicero follows Terentia’s advice to use the information to win over the aristocrats. He sends a copy of the transcript to his rival, Hortensius. The next day, on the eve of the election, the Senate convenes. Cicero delivers a furious speech, In toga candida, denouncing Hybrida and Catilina as puppets of a powerful, unnamed figure. He details Catilina’s crimes with such vehemence that Catilina lunges at him and has to be restrained by the consul’s lictors. After Catilina and Hybrida respond with “shrill tirades,” Cicero goes to Atticus’s house to wait and see if the speech has won over the aristocrats.

After several hours, during which Cicero and his allies worry that he has alienated several powerful men for nothing, Hortensius summons Cicero and Tiro to a secret nighttime meeting at the newly built palace of the general Lucius Lucullus. There, Cicero confronts the heads of the aristocracy, including Lucullus, his brother Marcus, Hortensius, Catulus, Quintus Metellus Creticus, and an elder statesman, Isauricus. After Tiro proves the authenticity of his shorthand record by transcribing their conversation, the aristocrats dismiss him and negotiate with Cicero for hours.

At dawn, a “grim” Cicero returns to Rome. On the Field of Mars, just as voting begins, Hortensius makes a dramatic public gesture of support, shaking Cicero’s hand and raising his arm. This signals that the aristocracy has swung its considerable influence behind Cicero. The voting proceeds, and the aristocrats’ bloc of votes systematically elevates Cicero and Hybrida while abandoning Catilina. Cicero wins the consulship unanimously, with Hybrida as his colleague. Catilina is defeated and ruined.

That evening, Cicero celebrates with his family. He confesses the price of the aristocrats’ support: He must oppose the popular land reform bill and propose triumphs for Lucullus and Metellus, moves that will alienate the common people and Pompey, respectively. Quintus is horrified, predicting that Cicero will be left without allies. Cicero, however, is resolved, stating that it was the only way to win. When he quips that Pompey is “simply a humble servant of the republic [...] More important […] he is not here” (304), even Quintus laughs. Later, alone with Tiro, Cicero contemplates his victory and how history will judge him.