American psychologist John Holden arrives in London to participate in a symposium aiming to expose witchcraft and devil-worship as a fraud, with attention centered on a cult run by a Julian Karswell. Debarking his plane, Holden learns that the symposium leader, Henry Harrington, has suddenly died and he is now in charg…

　　爱尔兰，Redmond Barry(瑞安·奥尼尔 Ryan O'Neal 饰）从小和母亲寄居在舅舅家，后来爱上了他的表姐Nora。Nora的父亲却想把她许配给一个英格兰将军John Quin。于是Barry向Quin提出决斗，决斗中Barry射中了Quin，误以为将他杀 死了，匆忙逃离家乡。路上他遭遇抢劫，走投无路只能加入英国军队。在军队中他才得知，其实Quin并没有死。Ba…