抗日战争前(👷)夕(🔨),黑龙(lóng )会杀手为日本(🐌)军方寻觅剧毒“全(quán )虫(chóng )”从而(ér )制(zhì )造(zào )秘(🎺)密武器,潜(qián )入药都百(bǎi )泉。却在几(jǐ )经周折的买药过程(🎲)中被药铺学(♑)徒常宝(bǎo )识破(⚫)身份。为(👑)挽(wǎn )(🎩)救全镇药(yào )商(🕖),阻止(zhǐ )日本(✳)人研(yán )制(zhì )武器,常宝同(tóng )日(rì )本人斗智斗(😚)勇。无奈之下,黑龙会杀手(😱)对全(🤷)镇药商(⏺)展开屠(tú )(📎)杀,迫使(🥁)他们交出全虫(chóng )。