It isn't very often that I come across a Thriller that has actually kept me on the edge of my seat. This film doesn't disappoint in this respect. The script is intelligently written, and the film score by Henry Mancini is a real treat. Warning: I recommend refraining from hot beverages while watching this movie. I almost scalded myself during a crucial scene. I don't want to give anything away, but you'll know the scene I'm talking about once you've watched it.