I must thank those kind friends of mine who live over the other side of the pond for the help they gave me in writing this one. Especially, the guys who came up with a method of getting hold of a gun over there. I must thank Techsan and my Lady Cibelle for their proof reading and editing skills.
Note: "Knocking Shop" can be a brothel. Although in this case it's used in it's more common colloquial meaning to refer to a Hotel or other such establishment, that has got a reputation as a place where illicit liaisons are known to take place.