Traitorous California Senator tries to use the newly founded Pony Express to further his plans for a California Republic, but Unionist Frisco Jack will try to stop him.

貌美村姑金小芳（李菁）勇敢機智，樂於助人。一日小芳到郊外邊歌邊摘橘柑，惹來七八個阿飛調戲，幸她及時召來村民，把眾阿飛趕走。事後小芳得知那群阿飛原是鉅富唐家大少爺唐尼（康威）的朋友，惴惴不安。唐尼欲代眾阿飛出頭，設計將小芳騙來，加以報復。小芳情人大海（凌雲）及時趕到，救出小芳，但二人寡不敵眾，形勢危急……