There is kind of a plot that this family man has a wish to go and kill a prostitute. He has a plan where his wife think he is going on a business trip but really he is going to pursue this killing.
As soon as the prostitute arrives at the hotel, the movie takes a turn from "normal" to "psychotic". The remaining 1 hour makes NO sense at all. Stuff happens, but without any point.
Why this movie was even produced is beyond my comprehension.
Review of Piercing
