What could be causing the rotten eggs smell in my study

Maybe a fish.

Alive thus far. It was apparently a swamp underneath the fridge which has now been removed. The place still smells a bit but improvements. Its election day here (and the weekend) guy promises to be back by Monday to finish it off.

I did not know that upper stories in brick houses with marble floors could get rot.

[QUOTE=Darryl Lict]
Lost Easter egg!

I seem to recall that you are from Pakistan, so that is probably unlikely.

[/QUOTE]

True, but its a house with lots of Chocalate lovers.

Incidentally something like 10 million Christians in Pakistan a much higher percentage than the national average where I live, so we do see lots of Easter Eggs.

Marble can be porous. You may have spilled something there.