If you have to choose ONE game, it can only be this one ! A pure masterpiece at all levels. Whether for the story and its characters, its absolutely fabulous graphics, (Among the most extraordinary of all HOGs....) its distressing and creepy atmosphere in a rural and isolated environment. Not to mention its videos played by real actors and perfectly integrated into the images, as well as its cinematic and soundtrack, both excellent. What a fantastic game ! IMHO, one of the three best with "Top Secret Finders" and "Shadow Lake". (This game also exists in CE, contrary to what I wrote by mistake in my comment of the SE....)

Excellent horror atmosphere. The puzzles are familiar if you've played any hidden object style graphic games, but it has a great spooky sensability to the artwork, music, and storyline.
The only real problem is this series concludes on a hard cliffhanger, and it's still not clear if they'll release a sequel.

This is one of my favorite games. I love the stark realism. Would like to see more of this type.