讲述了A市海关缉私局缉私三科成员，通过努力、英勇以及智慧，成功破获了一起贩毒案，并且顺藤摸瓜摧毁了一个大型国内贩毒集团，守卫了国门的安全的故事。

Coerced into suicide over usury, Liu Xiaomei’s friend Yan Ming avenges her by illegally kidnapping a loan shark manager’s daughter and a police captain’s daughter; the captain infiltrates the gang, rescues the hostages, and brings the criminals to justice.