I don't know that your world has an afterlife. It might not. Somehow I can't really see only this world or that world actually having one though. That seems... wrong. Broken.

It might just be that that world, for you, is further away and thus a lot harder to reach. In mine we have much more intimate interaction with death itself and we have a direct contact on things from other dimensional places anyway, which would make a difference too about our ability to reach out for those that have gone ahead.

Still, one thing that is known and accepted is that even if there is a way, you just don't do it. It's better that way.