林伟栋得了癌病。他为了筹集供弟弟伟梁到外国攻读医科的学费，替私枭招应强抢劫了一批钻石。他得手后把真的藏起来，偷龙转凤将假的交给招，招发觉便把他枪杀了。为了找回钻石，招布下诡计，做成伟梁是杀人嫌疑犯，又安排他的日籍女部下和美救了他，将他藏起来及替他治理枪伤。在和美细心治疗下，伟梁痊愈了，他们亦建立了深厚情谊。伟梁好友警探郭少彬被派侦查此案，他和伟梁无意发现伟栋收藏钻石，和美把钻石抢去，招赶到逼伟梁交出，他们交不出，招正想杀他们，和美突然返回和招发生打斗，打斗中和美被招杀死，伟梁亦把招杀死。

Knowing that he's dying from cancer, Lam feels a responsibility to come up with sufficient funds quickly so that his younger brother Wai-leong can complete medical school.