Have you ever made a bet ? a big bet? In the 1850s, a young American finds himself in London by chance. He is penniless, and yet he leads the luxurious life of a millionaire. How can he do this? It's all thanks to a bizarre bet, made by two eccentric gentlemen.

27歲的美國青年亨利駕船出海，被風暴帶到了倫敦。他身無分文，遭人白眼。正當他在街頭無奈徘徊之時，兩位古怪紳士的打賭把他從困境中解救出來。靠著一張百萬英鎊的支票，亨利在倫敦經歷種種奇遇，啼笑皆非。美國著名作家馬克．吐溫的名作，文筆生動幽默，令人忍俊不禁。