The Uninvited by Tim Wynne-Jones is a most excellent read. It is well written with full characters and rich dialogue.
Two people looking for peace and solitude find each other at a house on the snye (look it up, I had too!), but there is something else, someone else about. Or is there?
The Uninvited will grab you by the back of your mind and leave you with goosebumps of unconscious dread. All the while teaching, revealing how people, even family interact and react to one another and their environment.