The story of Selina DeJong and her son Dirk, whom she affectionately calls So Big. After the death of her husband, Selina raises So Big on her own while managing her deceased husband's farm in Illinois. When So Big grows up, he moves to Chicago, where he finds himself drawn to the fast-money stock-broker lifestyle of the 1920s. So Big is conflicted: he wants to live in the world of speculation and finance, but he's aware that his mother (and his love interest, an artist) are disappointed that he hasn't lived up to the hard-working, hardscrabble values instilled by his mother.
