Has anyone heard of''Barrister William Moore Law Firm?

I live in u.s.a. and I recieved an E-mail from this law firm.Stating that I'm a benificary from some dead guy who I do not know?
My question is? does this firm exist, here the address
Registered Office
Mitre House,160
Alders Gate street
London ECIA 4DD
#+447031865056
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