Ending #3:
You go to the room where you picked up the valve and Crea will lead
you to the laboratory (the place where you give astral pieces) and the man
will give you the red knife. Then you'll be whisked away and end up back in
the house. The police officer will ask you to leave. Then when you were about
to leave, you stab the police in the back. Not a great ending to me.