Jack Worthing, is a pillar of the community in Hertfordshire, where he is guardian to Cecily Cardew, the pretty, eighteen-year-old granddaughter of the late Thomas Cardew, who found and adopted Jack when he was a baby. In Hertfordshire, Jack has responsibilities: he is a major landowner and justice of the peace. For years, he has also pretended to have an irresponsible black-sheep brother named Ernest who leads a scandalous life in pursuit of pleasure and is always getting into trouble of a sort that requires Jack to rush grimly off to his assistance.
Algernon, who knows Jack as Ernest. Algernon suspects that Jack may be leading a double life, a practice he seems to regard as commonplace and indispensable to modern life. He calls a person who leads a double life a “Bunburyist,” after a nonexistent friend he pretends to have, a chronic invalid named Bunbury, to whose deathbed he is forever being summoned whenever he wants to get out of some tiresome social obligation.