Without saying too much, let's just say that Lau (playing Det. Bun) is a 'Mad Detective' who has an uncanny ability to read people and deduce crimes (think Sherlock Holmes meets Rainman). He's been called back by the police to help solve the case of a missing police detective. While the concept behind the character is fairly unique, it's been done before in different ways-but rarely as good as this.

What makes this film great is that it starts where most other films end. It gives you the big Shyamalan twist up front and then spends the next hour and a half trying to figure out what to do with it. This movie may set a new bar for richness of character.

Bun and the relationship he has with his wife provides some genuinely heart-wrenching moments. Lau really gets inside the character and you feel it, from beginning to end, emotional/psychological roller coaster and all. But we'd expect nothing less of To and Fai; they usually tend to populate their world with rich characters. Every actor turns in a stellar performance. Plus, we're treated to appearances by a fair number of To and Fai regulars.

'Mad Detective' really is a fresh take on the Crime/Murder/Mystery genre. But while fresh is good, it's not everything. This film succeeds in being smart and entertaining at the same time. Seeing such a great concept put together by such a talented team on both sides of the camera is truly great. Repeat viewings will reveal more and more subtle and intricate layers to an already brilliant film. There's really not much more to say, just watch it, already!