The story of the book primarily concerns the young and mysterious millionaire Jay Gatsby and his quixotic passion and obsession to reunite with his ex-lover, the beautiful former debutante Daisy Buchanan. Considered to be Fitzgerald’s magnum opus, The Great Gatsby explores themes of decadence, idealism, resistance to change, social upheaval and excess, creating a portrait of the Roaring Twenties that has been described as a cautionary tale regarding the American Dream.