Eager to make a great fortune and marry the love of his life, Cyril Paxton invests all of his money in the stock market and loses it all in a final disastrous speculation. A ruined man, Cyril decides to emigrate, but on the train to Southampton, due to a luggage mix-up, he switches bags with certain Mr. Lawrence, and gets in possession of the stolen Duchess of Datchet's diamonds. He is exhilarated by the change of luck, but he'll soon find himself pursued by both the robbers and the police.