Aston (Robert Shaw), a quiet, reserved man, lives alone in a top-floor cluttered room of a small abandoned house in a poor London district. He befriends and takes in Mac Davies (Donald Pleasence), an old derelict who has been fired from a menial job in a café. In time Aston offers him a job as caretaker of the house. Aston's brother, Mick (Alan Bates) - a taunting, quasi-sadist - harasses the derelict when his brother is away, countermanding his orders. Eventually Aston, himself irritated by the cantankerous old man, puts him out.

　　In 1828 Scotland, Edinburgh surgeon Dr. Knox does medical research on cadavers he buys from murderers Burke and Hare, without questioning the unethical procurement methods.

隐藏在金三角毒贩子唐恩少校单方面要给毒品涨价，用武器换毒品的马兹里尼上校决定派去一支队伍，借着送武器的名义打入唐恩防守严密的地盘，炸毁几个毒品仓库，借此警告唐恩，于是马兹里尼上校找到了雇佣兵中最出色的科尔比少校。另一方面为了查出药品管理局里谁在做鸦片生意，卡尔森派特工梅森混入希考克的雇佣兵队伍，让他拿出唐恩存资料的光盘，拿到光盘就能知道谁是间谍了。威廉姆斯是特工希考克的上级，为了拿到那张光盘，让希考克整容，变成了梅森的样子，扣下了真正的梅森。于是科尔比少校夹杂着几方势力的雇佣兵队伍出发了。在路上，经历艰难险阻，他们成功粉碎了翻译迪克洛和强盗里应外合的抢劫计划，终于到了唐恩的地盘，双方开战，希考克拿到了那张光盘，在关键时刻，一个雇佣兵莱宁斯和科尔比的朋友康果启动了炸弹，将唐恩的地盘炸得粉碎。最后只有科尔比和希考克胜利逃出来，所有人都死了。科尔比识破了希...