So tonight I'm taking my first stab at a psychological horror story that I'm dubbing "The Bitter Cold". Pretty self explanatory; there's a third ice age and temperatures keep dropping and it follows one family through their sort-of-survival. In the end the brother who was slowly going insane the entire time murders his sister and walks out into the cold in the middle of the night, never to be seen again. So I've found little on how to actually write psychological horror. It revolves around peoples' own faults and failures, sometimes employing supernatural things. I'm interested on to make this scary. I don't read psychological horror (closest I've come is watching The Shining). Any tips on how to make this work? Any special keywords to create fear, or words to avoid?