This psychological puzzle from Johnnie To has an interesting premise that makes you think you have everything figured out, but still manages to surprise multiple times. The main characters are pretty well-constructed (despite the suspension of belief needed for the titular character), and well-played. There are some really stand-out moments (whistling, the young cop talking to the mad detective's wife, ordering food). Admittedly, I got a little bit lost along the way, but it was still a fun ride all the way to the Lady of Shanghai-inspired end sequence.