The movie holds a scary and eerie atmosphere from beginning to end.
The car crash may be a little intense for some.
As the movie progresses the main character grows more and more distressed, sometimes experiencing supernatural events (not knowing whether they are real or just in his head), with sightings of ghosts. Also, the tension grows deeper.
While not overly violent like other scary films, this one does carry a solid feeling of uncertainty and oppression, along with a scary atmosphere. This manifests more in the main character.