Grim Facade: Sinister Obsession 

Grim Facade: Sinister Obsession is yet another hidden object developed by ERS Game Studios where you play as a detective looking for a serial killer. You will travel all the way to Italy, at the Conti Villa, where your objective is to find out who is behind the mysterious murders at the manor.

The game is filled with numerous challenges where your goal is to find missing items on a scene, solve riddles, etc. After you complete a puzzle, the app automatically saves your progress and you can move on to the next mission.

Another advantage is that you can create multiple player profiles so other users can play the game, without overwriting your current saves. Furthermore, you can always change the game mode (Casual, Advanced, and Hard).

The only aspect I don't like is that fullscreen or windowed mode changes take effect only after you restart the app.

Other than that, not much more can be said about this hidden object game except that it's very entertaining and addictive. So I'd say it's definitely worth buying Grim Facade: Sinister Obsession for your computer, especially if you're into playing puzzle games in your spare time.