Finding relatives was always a topic which interested me marginally, so I was interested in checking out the Finders UK website (which BTW, can also be read in other ways because URLs don’t have the concept of capitalization implicitly – lets just leave at that). They offer different services like tracing heirs. Unfortunately (for me) their services are limited to the UK (then again, it makes the company much more compelling, since supposedly a company can offer the best services by specializing in one core competency).
They don’t have a public price offer, but this is understandable since the amount of work involved can vary wildly between cases. All in all this looks like a good company if you need such services in the UK (the links on their webpage to different industry associations are all legitimate, even though some of them a little out of date). They also support two non-profit organizations: the Marie Curie Cancer care and Missing People, which is very generous of them.
Full disclosure: this is a paid review from ReviewMe. Under the terms of the understanding I was not obligated to skew my viewpoint in any way (ie. only post positive facts).