This is a supernatural "thriller" about a mysterious cult that is murdering famous scientists (why?) by spontanteous combustion. Our hero, played by the talented Andy Lau, is a scientist on the list who has police protection forced on him, but will only accept his old friend the cop, played well by the accomplished Anthony Wong, as a bodyguard. Things get weird as Andy's dead fiancee starts appearing to him and everyone else and soon it becomes clear as the cult invites him into their inner sanctum, that God is pissed and everything falls to Andy making a decision.
Despite competent direction and good acting all around, this just drags on, makes no sense in many places, and has a ridiculous sappy ending that will make just about anyone cringe. The few positive moments are all in snappy banter between the two friends and virtually no action exists here. Unless you can't resist the re-united beyond the grave love story thing, avoid this one.