Incredible game, if you own a Wii or a Gamecube and you don't own this game, you are missing out!
One of the great features from Eternal Darkness is the way it handles the "scares". The game actually breaks the fourth wall on several occasions depending on your characters "sanity meter", if it goes too high then effects will start happening. I don't want to ruin these effects for you, but needless to say they are incredibly spooky and on several occasions made me actually jump.
You play as several different characters during several different Eras, some from even hundreds of years ago. All of the central to the main character. I can't say much about the characters without spoiling it because part of the joy is finding out who you will be playing as next.
If you can still track down a copy of this wonderful game, immediately buy it! You will not be disappointed with this game.