'Barnum' tells the story of the Prince of Humbug, Phineas Taylor Barnum. Over the objections of his wife, Charity, Barnum attempts to create a show in which the main attractions include the oldest women alive, Joice Heth, the smallest man in the world, Tom Thumb, and to top it all off, a glamorous Swedish opera singer, Jenny Lind. Eventually, to appease Charity, Barnum agrees to give up the show and start a normal life returning to the circus business in grand fashion by forming a partnership with James A. Bailey to form a grander-than-life attraction - the Greatest Show on Earth.