"The Center of the World" explores Roosevelt's family background and education, looking for clues to the coddled rich child's ascent to political success. It follows him from his very first run for political office as New York state senator through his years in Washington as assistant secretary of the navy, as he pursues the highest office in the land. This segment also tells the story of FDR's courtship of his distant cousin, Eleanor Roosevelt, and their troubled marriage, including FDR's affair with Eleanor's social secretary, Lucy Mercer. The affair, which nearly ended the marriage, encouraged Eleanor to embrace a life of her own and become politically active.