This is probably as good as it gets, at least as far as modern Hindi dayan movies go.
After tormenting him as a child, and having killed his father and very cute baby sister, it looks like the dayan is back for him. Is it the pretty foreign-returned girl who has mysteriously turned up at his magic show, and now wants to buy his old dayaned apartment? Who is after his girl friend's life? In the world of the devil, accessed by taking down the building's rickety life to 666, he must face the dayan, and his own shocking truth.
The movie has a decent first half, and builds up the tempo well, with subtle yet effective "horror", with some excellent SFX. It gets a little predictable in the second, and the dayan's antics become a little comic, but overall, not too bad a movie (especially when compared to a lot of the nonsense that's been dished out in recent times).
As cast, Emraan is his usual self, extremely competent and natural. He is very ably assisted by the three lead female characters: Konkona as the dayan from his childhood, Kalki as the foreign returned girl and Huma Qureshi as his girl friend.
There are a couple of needless songs, and the end could have been executed better, but I would rate this movie 3 out of 5.