Normally I am not much into hidden object games. More an Adventure/RPG type of gamer. But this game is done very well. It is very loosely based on 'The Hound of the Baskervilles' (actually so loosely that it has little to do with it ), however the creators just made a game that is fun to play and that is more important than trying to make a game realistic or following some story.
Contrary to most adventure/casual games this has quite a lot of different kind of puzzles. For instance, one based on planar graphs, a puzzle based on rotating groups of tiles (which I found the most difficult yet solvable after a little thought), a few about identifying objects in a scene etc. It is nice to see a game with such a variety. The renderings are awesome. Don't expect much animation though the game is mainly still pictures with some animation happening when you solve a puzzle but the game still looks gorgeous.
Another thing is that the game isn't too easy yet can be solved without a walkthrough. There are also buttons that let you skip a puzzle when you are stuck or ask for help. I skipped one puzzle ( the one where you have to compare, the painting of a vase, to the 'real thing' and find the differences) because I needed to quit).
I clocked in about 16 hours.