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Book Two

Book Two begins with Nikolai Rostov returning on leave to Moscow accompanied by his friend Denisov, his officer from his Pavlograd Regiment. He spends an eventful winter at home. Natasha has blossomed into a beautiful young woman. Denisov falls in love with her and proposes marriage but is rejected. Nikolai meets Dolokhov, and they grow closer as friends. Dolokhov falls in love with Sonya, Nikolai's cousin, but as she is in love with Nikolai, she rejects Dolokhov's proposal. Nikolai meets Dolokhov sometime later. The resentful Dolokhov challenges Nikolai at cards, and Nikolai loses every hand until he sinks into a 43,000-ruble debt. Although his mother pleads with Nikolai to marry a wealthy heiress to rescue the family from its dire financial straits, he refuses. Instead, he promises to marry his childhood crush and orphaned cousin, the dowry-less Sonya.

Pierre Bezukhov, upon finally receiving his massive inheritance, is suddenly transformed from a bumbling young man into the most eligible bachelor in Russian society. Despite knowing that it is wrong, he is convinced into marriage with Prince Kuragin's beautiful and immoral daughter Hélène (Elena Vasilyevna Kuragina). Hélène, who is rumored to be involved in an incestuous affair with her brother Anatole, tells Pierre that she will never have children with him. Hélène is also rumored to be having an affair with Dolokhov, who mocks Pierre in public. Pierre loses his temper and challenges Dolokhov to a duel. Unexpectedly (because Dolokhov is a seasoned dueller), Pierre wounds Dolokhov. Hélène denies her affair, but Pierre is convinced of her guilt and leaves her. In his moral and spiritual confusion, Pierre joins the Freemasons. Much of Book Two concerns his struggles with his passions and his spiritual conflicts. He abandons his former carefree behavior and enters upon a philosophical quest particular to Tolstoy: how should one live a moral life in an ethically imperfect world? The question continually baffles Pierre. He attempts to liberate his serfs, but ultimately achieves nothing of note.

Pierre is contrasted with Prince Andrei Bolkonsky. Andrei recovers from his near-fatal wound in a military hospital and returns home, only to find his wife Lise dying in childbirth. He is stricken by his guilty conscience for not treating her better. His child, Nikolai, survives.

Burdened with nihilistic disillusionment, Prince Andrei does not return to the army but remains on his estate, working on a project that would codify military behavior to solve problems of disorganization responsible for the loss of life on the Russian side. Pierre visits him and brings new questions: where is God in this amoral world? Pierre is interested in panentheism and the possibility of an afterlife.

Pierre's wife, Hélène, begs him to take her back, and trying to abide by the Freemason laws of forgiveness, he agrees. Hélène establishes herself as an influential hostess in Petersburg society.

Prince Andrei feels impelled to take his newly written military notions to Saint Petersburg, naively expecting to influence either the Emperor himself or those close to him. Young Natasha, also in Saint Petersburg, is caught up in the excitement of her first grand ball, where she meets Prince Andrei and briefly reinvigorates him with her vivacious charm. Andrei believes he has found purpose in life again and, after paying the Rostovs several visits, proposes marriage to Natasha. However, Andrei's father dislikes the Rostovs and opposes the marriage, insisting that the couple wait a year before marrying. Prince Andrei leaves to recuperate from his wounds abroad, leaving Natasha distraught. Count Rostov takes her and Sonya to Moscow in order to raise funds for her trousseau.

Natasha visits the Moscow opera, where she meets Hélène and her brother Anatole. Anatole has since married a Polish woman whom he abandoned in Poland. He is very attracted to Natasha and determined to seduce her and conspires with his sister to do so. Anatole succeeds in making Natasha believe he loves her, eventually establishing plans to elope. Natasha writes to Princess Maria, Andrei's sister, breaking off her engagement. At the last moment, Sonya discovers her plans to elope and foils them. Natasha learns from Pierre of Anatole's marriage. Devastated, Natasha makes a suicide attempt and is left seriously ill.

Pierre is initially horrified by Natasha's behavior but realizes he has fallen in love with her. As the Great Comet of 1811–12 streaks across the sky, life appears to begin anew for Pierre. Prince Andrei coldly accepts Natasha's breaking of the engagement. He tells Pierre that his pride will not allow him to renew his proposal.