War And Peace, Vol. 3 by Leo Tolstoy

This volume follows the principal families as the 1812 French invasion disrupts their lives: households are uprooted, the young Natasha is swept into a passionate and ultimately ruinous entanglement that shatters engagements and family hopes, the Rostovs face hardship and exile, and both Pierre and Prince Andrei are driven into profound moral reckonings—Pierre through captivity and unexpected human bonds, Andrei through battlefield injury and disillusion—while the narrative contrasts intimate emotional crises with the vast chaos of war to examine fate, freedom, and the formation of character.