First, Let me clear up a misconception left by a previous reviewer:
THIS MOVIE IS NOT 'DIE HARD' AND DOES NOT TRY TO BE!
That being said, Its remarkably similar to 'The Face of Fear', Except for in the beginning, she's alone. Trapped carries suspense very well. The acting, while not the best, does well to put you in the movie. Its very easy to see yourself, almost alone, running though a labyrinth of corridors and doors trying to find a way out. One of the things that 'Trapped' does better then 'The face of Fear' is use dead-quiet scenes to convey the vast and oppressive building itself. Indeed, the building seems to have a character of its own, aiding the madman on his rampage.
The madman, whom its almost possible to sympathize with, says little thought the film, adding to the creepiness. Not quite my best suspense film of all time, but quite good. The male hero is almost an anti-hero when we learn that he's in the building doing espionage.
All in all, a well done movie that deserves recognition.