A family made up of parents and two children (boy and girl) is attacked by a murderer with a hood and mask of a ?demon? perhaps.

The parents are murdered, and one scene shows the youngest daughter looking up some stairs where the murderer is shown.

Years later, the daughter confronts the murderer in a kind of factory full of pipes to find out that her brother was under the mask.

As I remember the murderer manages to escape.

I can't find any pictures of the mask used.