A man, instructor of carpentry, shows unexpected interest in a new student. After some time of watching his following the young man. We find through the man's dialogue with his ex-wife, that the boy was the killer of their child some four years before the movie action takes place.
The nervous camera, and chest and above shots with handheld camera, give the movie a very tense mood. The man's enigmatic stare is always deformed through his thick glasses. Until the very end, we don't know what he'll do. Neither does him, as he says is the most meaning-full 'I don't know.' that I can recollect on cinema.