陈计明替女朋友霍转红在郊野庆祝生日，突然有神秘郭洲自称偷渡犯，要求二人帮忙打电话，二人最后只好答应，郭洲更送予陈计明一块玉牌。就在当晚熟睡之际，陈计明竟梦见偷渡客与老婆被其同党叶太能、曾泉、杨多所杀，惊醒之下，郭洲果然出现要求陈计明替其报仇，陈拒绝，惨被郭洲的鬼魂侵入身体。

Drug courier Lousy Chao and his wife Ngor are killed by his boss, after being framed for drug substitution. His ghost finds a man with the same birthday, Ming, to help take revenge. The unfortunate Ming has just proposed to Hung, but Lousy hijacks his body, and starts by killing his immediate boss Shing Yiang To in a sauna. This alarms Shing's boss Nan. Meanwhile, the possessed Ming take nightclub host Jenny home for "late supper". Hung is sure something is amiss, and consults her taoist uncle Shun. Nan is further shaken when his partner Chuen is killed, but still keeps an appointment with Thai drug dealer Buddha. Up until this point, both Ming and Nan consider ghosts to be "bullshit", but they are soon convinced otherwise...