Floatinghead's dream adventures

I am in a large building, a castle I think. It's expansive and made of cold stone. I find a small alcove tucked away and follow it into a secret cave like room. It seems to be someones secret hid-out - but, on my left, near the entrance is what looks like a magazine stand. Though the magazines consist of porn, drugs and all sorts of illegal stuff - it's like an illegal tuck shop. On the wall below the shop stand are scrawls and decals, the decals are arrows pointing below with words like 'don't look down' 'watch out below' etc. I look down and see a large drop to another part of the cave, just a small area - I have no idea what it is for...

... Meanwhile a detective is sniffing around the area, he's gonna find us out - is this a setup?