Intervention

Intervention is a mission in Assassin's Creed: Brotherhood.

Description
Micheletto confesses to Ezio that to ensure Pietro death, he poisoned his wine. After sparing Micheletto, Ezio orders his apprentices to cut Pietro down from the cross. Unable to walk himself, Ezio carries him to the closest doctor to counteract the effects of the poison and in return acquires the key to the Castel Sant'Angelo. Upon acquiring the key, Ezio notices a thief walking past the Colosseum and recognizes him as the man that was present at the Villa attack. Chasing the man down, it is revealed that he is the traitor. Rushing back to Tiber Island, Ezio prevents La Volpe from killing Machiavelli, and informs them of the real traitor.

Dialogue
Two recruits throw knives at the rope holding Pietro to the cross. Ezio lifts him from the ground as he appears too weak. Ezio runs through the crowd while carrying Pietro. A few mercenaries enter the Colosseum.
 * Ezio: Cut him down. (To his recruits.)
 * Pietro: This was not in the rehearsal!
 * Ezio: Hold off the guards.
 * Mercenary: Ezio, we are here to help!
 * Ezio: Stop the guards!
 * Pietro: Who are you?
 * Ezio: Your savior.

The Doctor
Ezio gets Pietro to a doctor near the Colosseum; He gives Pietro a vial. A short time later.
 * Ezio: He has been poisoned.
 * Doctor: That pallor. Cantarella. Drink this.
 * Ezio: Hurry!
 * Doctor: Give him a moment.
 * Pietro: I feel slightly better.
 * Doctor: Leeches will lead to a full recovery.
 * Pietro: I cannot thank you enough. I---
 * Ezio: The key to the Castel Sant'Angelo. Now.
 * Pietro: What are you talking about? I'm simply a poor actor--
 * Ezio: Cesare knows about you and Lucrezia.
 * Pietro: Here.

Don't I know you?
Pietro hands over his key to Ezio. Ezio then notices a familiar thief. The thief starts to run away, and orders the nearby guards around the Colosseum to attack Ezio. However, he is able to avoid the guards, and continues to chase the thief, eventually tackling him. Ezio takes the letter the thief was holding and notices the Seal of the Borgia, and realizes that this thief was the traitor all along. Ezio then threatens to kill him with his hidden blade.
 * Ezio: Un momento! (Hey!) You were at the Villa Auditore during the attack!
 * Ezio: Why did you run?
 * Paganino: I--
 * Ezio: You are the traitor, not Machiavelli. (Pointing his hidden blade at the thief's throat.)
 * Paganino: Long live the Borgia! (Pierces himself in the throat with Ezio's blade.)
 * Ezio: Merda! I was right. I have to stop Volpe before he gets to Machiavelli.

Volpe and Machiavelli


Ezio hurries to Tiber Island to stop La Volpe from killing Machiavelli. When he reaches La Volpe, he is ready to strike Machiavelli from behind, but Ezio quickly approaches, and stops him.
 * Ezio: I have discovered the traitor.
 * La Volpe: What?
 * Ezio: One of our men, he was at the Villa attack. Here, he carried this letter. (Shows the letter taken from the thief.)
 * La Volpe: My God!
 * Machiavelli: This is good news.
 * Ezio: More than you know.
 * La Volpe: I am once again in your debt, Ezio.
 * Ezio: What debt is there amongst friends who trust one another?
 * La Volpe: Yes. Thank you for relaying the message in time. (To Machiavelli) Come Niccolò, it has been far too long since we've talked.
 * Machiavelli: I heard the Colosseum Passion Play took an unexpected turn this evening.
 * La Volpe: Really?
 * Machiavelli: It seems Gesù Cristo was resurrected three days early.

Outcome

 * Ezio Auditore obtains the key to the Castel Sant'Angelo, and the traitor who has been informing the Borgia of the Assassins every move is killed.
 * Machiavelli regains La Volpe's trust.

Trivia

 * To achieve full synchronization, the player should not swim while returning to Tiber Island.