Roxy, a slave who is only one-sixteenth black, serves as a nanny to her master's son, Tom Driscoll, who was born the same day as her own son, Chambers. Afraid that Chambers will one day be sold to another family, Roxy switches the two infants, who look almost exactly alike. Only Pudd'nhead Wilson, the town's laughing-stock, is able to figure out her ruse and set things right. Written during a period of great tragedy in Mark Twain's life and great social unrest in America, Pudd'nhead Wilson rises above its farcical plot to ask pointed philosophical questions about society, values, and racism.