The Colour Out of Space

Wow, just wow. I honestly just had to keep reading towards the end. A short story, but what a story. There's a lot less preamble and tension build-up compared to some other Cthulhu stories - the sense of dread is right there right from start to finish. There's this eerie creepy feeling from the descriptions and the imagery of what the characters were seeing and experiencing. And then there's this chilly lurking feeling that something's there, from the purposeful lack of descriptions or explanations, that just draws you in and sends your imagination running. So far Call of Cthulhu was my favourite, but I think this trumps it for me.