If you enjoy hidden item games then I do recommend this one, however, I also recommend you play all four in the series in order. Each game is an experience and unique in its own way.
This one is a big step forward from the first Midnight Mysteries but also a few steps back. Nice graphics, better interface, achievements and hidden things to find and do...all great. The story however is a bit all over the place and seems to lack direction. And this can lead to aimless wandering at certain points. Also, some puzzles give you little to know clue on what you need to do next.
Flaws aside, the game is worth playing. I wouldn't buy it alone though, you should buy the Midnight Mysteries bundle and enjoy them all.