They, too, are a multinational group, led by a German named Hans Gruber (Alan Rickman) who is well-dressed and has a neatly trimmed beard and talks like an intellectual and thinks he is superior to the riffraff he has to associate with. He has a plan that has been devised with clockwork precision involving the theft of millions of dollars in negotiable bonds, and it is only after Willis starts causing trouble that he is forced to take the Nakatomi employees as hostages.

The terrorists are skilled and well-armed, and there are a lot of them. Willis' strategy involves keeping them off guard with lightning attacks from his hiding place on an upper floor of the building that is still under construction. This plan involves the deployment of a great many stunts and special effects, such as when Willis swings through a plate glass window on the end of a fire rope or when he drops plastics explosives down the elevator shaft.

On a technical level, there's a lot to be said for "Die Hard." It's when we get to some of the unnecessary adornments of the script that the movie shoots itself in the foot. Willis remains in constant radio contact with a police officer on the ground (Reginald Veljohnson) who tries to keep his morale up. But then the filmmakers introduce a gratuitous and unnecessary additional character: the deputy police chief (Paul Gleason), who doubts that the guy on the other end of the radio is really a New York cop at all.

As nearly as I can tell, the deputy chief is in the movie for only one purpose: to be consistently wrong at every step of the way and to provide a phony counterpoint to Willis' progress. The character is so willfully useless, so dumb, so much a product of the Idiot Plot Syndrome, that all by himself he successfully undermines the last half of the movie. Thrillers like this need to be well-oiled machines, with not a single wasted moment. Inappropriate and wrongheaded interruptions reveal the fragile nature of the plot and prevent it from working.

Without the deputy chief and all that he represents, "Die Hard" would have been a more than passable thriller. With him, it's a mess, and that's a shame, because the film does contain superior special effects, impressive stunt work and good performances, especially by Rickman as the terrorist. Here's a suggestion for thrillermakers: You can't go wrong if all of the characters in your movie are at least as intelligent as most of the characters in your audience.