1720: Tom Mackenzie, a confidence trickster from Scotland, steals a certificate for £100 worth of South Sea Company stock. He uses this to gain the confidence of Mrs. Trundle, Jack Plaster and other Southwark villains and together they set up a company known as Universal Improvements Ltd. Working on the gullibility of rich and poor alike they issue shares in innumerable bogus companies for fantastic and improbable schemes. The craze escalates until even the Government and Royal Family are involved and a crash is inevitable.