在这部魔鬼之足悬疑/犯罪片中,魔鬼降临……一个寒冷的夜里，四兄妹在家玩纸牌，凌晨，妹妹僵死在椅子上，另两个兄弟坐在她的周围，疯疯癫癫又唱又叫，每个人脸上呈出一种极度惊恐的表情……
侥幸逃过一难的老大随后证实：在他们打牌时，窗外的草地上，似乎一直有什么东西在移动…
Suffering from depression and nearing a breakdown, Holmes is accompanied by Watson to Cornwall for rest and recuperation as they tour the area's scenic coastal cliffs and Neolithic sites. The tranquility is interrupted by news that an unexplained tragedy has suddenly struck three siblings while playing cards in their home. The sister has apparently died from apoplexy, and her two brothers are suffering from acute dementia with expressions of fear and horror frozen on their faces. Showing great will power, Holmes discards his cocaine hypodermic and scrutinizes those involved in the case: an estranged third brother, the local vicar, and an enigmatic big game hunter and African explorer.
