The Haunting of Hill House - Shirley Jackson

Alone in the world, Eleanor is delighted to take up Dr Montague's invitation to spend a summer in the mysterious Hill House. Joining them are Theodora, an artistic 'sensitive', and Luke, heir to the house. But what begins as a light-hearted experiment is swiftly proven to be a trip into their darkest nightmares, and an investigation that one of their number may not survive.