The movie holds your attention from the time it starts until the time it concludes. While there isn't "major action" there is enough intrigue and suspense to keep the viewer reeled in for the full time.

This movie also has a massive amount of symbolism which might be fun for 2nd or 3rd time viewers to look into. Through the use of numbers, shadows, and various other techniques, the director plants clues and secrets throughout.

Brilliantly done. The book is also a good read as well!