In the Eighteenth Century, in a small village in Ireland, Redmond Barry is a young farm boy in love of his cousin Nora Brady. When Nora engages to the British Captain John Quin, Barry challenges him for a duel of pistols. He wins and escapes to Dublin, but is robbed on the road. Without any other alternative, Barry joins the British Army to fight in the Seven Years War. He deserts and is forced to join the Prussian Army, saving the life of his captain and becoming his protégé and spy of the Irish gambler Chevalier de Balibari. He helps Chevalier and becomes his associate until he decides to marry the wealthy Lady Lyndon. They move to England and Barry, in his obsession of nobility, dilapidates her fortune and makes a dangerous and revengeful enemy.

A young British clerk in a gloomy North Country undertaker's office, Billy is bombarded daily by the propaganda of the media that all things are for the asking. This transparently false doctrine, coupled with the humdrum job and his wild imagination, leads him on frequent flights to "Ambrosia," a mythical kingdom where he is crowned king, general, lover or any idealized hero the real situation of the moment makes him desire. His vacillating commitment and post-adolescent immaturity have created situations which make Ambrosia all the more attractive. He's succeeded in becoming engaged to two different girls, simultaneously, while in love with a third, Liz. He's in hot water with his employer, having spent a rather large sum of postage money on his personal frivolities. And last, but not least, his dream of becoming a highly-paid, famous scriptwriter in London seems doomed to failure. The only person in his life capable of bringing him down to earth is Liz, and she's having a difficult ...