E.X. Giroux was in fact a pseudonym for Doris Shannon, and in that guise she catered to much of the English-speaking world. Born in the US in 1924, she grew up in Canada, and is best known for her series of spectacularly civilized mysteries set in England. The novels feature Robert Forsyth, a Londoner who, thanks to a vague but much mentioned scandal, no longer practices law but does solve crimes as a sideline. Ms. Shannon died in 2012 in upstate New York and is survived by her two daughters.