Jack Worthington has invented a rakish brother, Ernest, who calls Jack away from family duties and gives him an excuse to travel to London. Similarly, Algernon Moncrieff has created the persona of Bunbury, an invalid friend, who periodically requires his services in the country. Both young men cleverly use their invented alter egos to disguise their misdemeanors until Jack discovers that Algernon has been impersonating Ernest, to woo Jack's young ward, Cicely. To make things just a bit more complicated, Algernon's cousin Gwendolyn loves Jack, but thinks Jack's name is Ernest. This enduring comedy of manners rises on a farcical crescendo until true identies are revealed and both couples end up happily united.