The Haunting of Hill House by Shirley Jackson
A must-read for fans of horror, The Haunting of Hill House is one of Shirley Jackson's greatest novels and one of the scariest stories I've read in a long time. Set in a house built with evil intents, the story follows four individuals who are investigating the claim that this is a haunted house. The explorers quickly find they've bitten off far more than they can chew, however, as the house begins to awaken each night and torment them. Best read with your back to a door during a dark evening, with the lights off and the wind lashing at your windows.