麦克是一个工作尽职尽责的警察，也是因为这样原因他的妻子成为了他的前妻。他前妻的新婚丈夫罗利是一个聪明的发明家。一系列的连环谋杀案发生了，狡猾的凶手即将浮出水面，麦克找到罗利希望他能帮助他突破这最后的难关，罗利带上自己先进的“设备”来帮助麦克，最终行动却以麦克牺牲的结局结束了。罗利决定将这个事情查清楚，原来连环谋杀案背后还隐藏着更大的阴谋。F/X man Rollie Tyler (Bryan Brown) is now a toy maker. Mike Brandon (Tom Mason), the ex-husband of Rolly's girlfriend Kim(Rachel Ticotin), is a cop. He asks Rollie to help catch a killer. The operation goes well until some unknown man kills both the killer and Mike.Mike's boss, Ray Silak (Philip Bosco) says it was the killer who killed Mike but Rollie knows it wasn't. Silak is involved with Mike's death, so he calls on Leo McCarthy (Brian Dennehy), the cop from the last movie, who is now a P.I., for help and they discover it's not just Silak they have to worry about.