老实的青年吴聚财（谢贤）不得已用假枪抢劫，抢着了同样贫穷的同学周日清（胡枫）。周日清诡计多端，两人同当经纪人，结成难兄难弟，生意渐渐好起来。他们共同追求家庭教师邓秀莹（南红），邓秀莹的未婚夫在南洋要来港治病。她为了借钱给未婚夫治病，险些被老板侮辱。后来邓秀莹的未婚夫因病去逝。未婚夫的妹妹徐琳（江雪）来香港发展。周日清与邓秀莹，吴聚财与徐琳感情日好，结为连理，共同打造“兄弟商店”。

Adapted from a popular 'three dime novel' the story revolves around two down-and-out buddies, one streetwise and quick-witted the other naïve and kind-hearted. This oddball duo go through up and downs and eventually get their break in life.