詹姆森·帕克

　　Major Palgrave, an idiosyncratic but charming mystery writer, reveals to Miss Marple that one of the guests at a luxurious Caribbean resort they're staying at is a Bluebeard-type wife murderer. Unfortunately, the Major succumbs to an apparently accidental overdose of alcohol and blood pressure medication before revealing the killer's identity. When it's discovered that the medicine belonged to another guest and the revealing photograph the Major was carrying is missing, Miss Marple realizes that the serial killer has struck again and more murders will follow.

　　在洛杉矶一间废置的教堂里，一个牧师召集了一班学生与科学家，研究他们找到一个盛有绿色液体的玻璃管。这枝玻璃管可以将魔鬼之子释放，最终可以将魔鬼带到人间，世界末日便会来临。

　　朱莉（克里斯蒂·麦克尼科尔 Kristy McNichol 饰）是一名女演员，一次意外中，她驾车撞伤了一只狗，四处求医无门又不忍心弃之不管的朱莉最终决定将狗收留。有狗狗陪伴在身边，朱莉的心中多了一份安全感，当她看见狗和入室抢劫的歹徒英勇搏斗之后，朱莉更是对这只勇敢的动物充满了信任和依赖。　　随着时间的推移，朱莉发现对自己忠心耿耿的狗对黑人却有着超乎寻常的强烈攻击性。原来，在幼年时期，狗曾经经受过十分残酷的训练，用以将它变成攻击黑人的“武器”，为了恢复狗纯良的本性，朱莉找到了驯兽师查理（塞缪尔·富勒 Samuel Fuller 饰）驯化狗。经过不懈的努力，查理的训练终于初见成效，不幸的是，意外还是发生了。