Madame Zhou’s betrayal of Lin is revealed through a letter from Didier Levy and becomes the personal motive behind Lin’s decision to join Abdel Khader Khan’s war and return alive. The disclosure turns Lin’s imprisonment from an unexplained misfortune into an act of retaliation, and redirects his grief toward a specific enemy.

The Letter and the Disclosure

Two hours after Khaled Ansari gave Lin a letter in a taxi, Lin read it during a gathering where the Blind Singers were performing. Didier’s message said he had learned that Madame Zhou, the owner of the Palace, had betrayed Lin to the police, causing his imprisonment and beating. Didier reported that his sources were reliable, but that he had not discovered her reason. The letter therefore supplied the identity of the betrayer while leaving Lin to reconstruct the motive.

Lin’s Reconstruction of the Motive

As he read, Lin recalled Rajan, Madame Zhou’s servant, watching him with hatred on the day Lin and others rescued Karla from the Taj Mahal Hotel during the flood. Lin remembered Rajan observing him with Karla and then seeing him leave in a taxi. Later that night, police arrested Lin, and his prison ordeal began. Lin understood the sequence as evidence that Madame Zhou had punished him for defying her: challenging her authority, impersonating an American consular officer, taking Lisa Carter away from her, and perhaps loving Karla. The letter confirms her role in the betrayal; the personal motive is Lin’s conclusion from the remembered encounter and the events that followed.

Revenge and the Decision to Return

Lin tore up the letter and put its pieces in his pocket. The discovery settled why he would go to war with Abdel Khader Khan and why he intended to return: he was drawn by the love he felt in Abdel Khader Khan’s gaze, which answered the absence of a father in his life, while his hatred of Madame Zhou gave him a purpose for surviving. Lin recognizes that going to war for love is foolish, but weighs it against surviving only for revenge. He resolves that if he makes it through the war, he will find Madame Zhou and kill her. The betrayal thus binds two motives—attachment and vengeance—to the same dangerous journey.