Spanning the years from the Civil War to World War I, East of Eden traces two families through California's fertile Salinas Valley: the Trasks, wealthy and haunted by inherited sin, and the Hamiltons, poor, hardworking immigrants whose story mirrors Steinbeck's own family history. At the center is Adam Trask, whose inheritance and marriage to the beautiful, monstrous Cathy Ames set in motion a generational tragedy that falls hardest on his twin sons, Cal and Aron.
Steinbeck builds the novel as a deliberate retelling of Genesis — brothers competing for a father's love, a fall from innocence, the mark of Cain — most explicitly through the novel's central word, timshel, Hebrew for "thou mayest," which Adam's Chinese servant Lee uncovers as the story's argument against fatalism: that people are not doomed by their nature or their parents' sins, but free to choose good.
Sprawling, ambitious, and populated by some of Steinbeck's richest characters, East of Eden is his most personal novel and, by his own account, the one he considered his masterpiece — a sweeping American epic about inheritance, free will, and the possibility of redemption.