Leave it alone - if your dearly departed want to make contact they will find a way to do it. After all, they are in a much better position to find you than some charlatan is to find them.

I don't actually believe one way or the other - my dad has been dead for 30 years and I've heard nothing - not even a postcard - and he should have known there have been times when I REALLY could have done with having him around!