Missing item: Hollow needle at the end of the cellar

[Alleycat]

After barely escaping the invisible monster I'm stuck behind the door at the end I can't open, there's supposed to be a hollow needle on a shelf but it's not there. I've tried restarting the level a few times but it never appears. I guess I must have a corrupt save game file (I used the one from the demo - that I brought to the save game folder of the new steam install). I verified the cache of the game through steam. Is there anyway to fix this manually or should I restart the game from the beginning?
I've tried attaching the save game files in case it helps...but it says it's too big!