Similar movie
I am looking for a similar movie.
There was a person who moved into an appartement building. In the night there was loud music from another appartement, so he dialed the number of that appartement to complain. While doing so he lied and said that he was from a different appartement in the same building. Next morning they find the person he impersonated murdered. Next he climbs to the supposed murderers appartement through the balcony (if I remember correctly). There he finds a sound proof room.
Can't remember much else or what happened later in the movie. Any ideas?
(Grissom): -Are you a terrorist?
(suspect): -Depends, are you terrified?