Never since the days of the Fenian outrages had the mind of the public been so filled with apprehension as it was during the two days following the appearance in the Commons of the 'blank bomb', as one journal felicitously described it.
Perhaps in exactly the same kind of apprehension, since there was a general belief, which grew out of the trend of the letters, that the Four menaced none other than one man.
Oooh, what a seasonally appropriate start to the plot. After all, Guy Fawkes Night is on Tuesday.
As for The Four Just Men, it is difficult for me to not be reminded of The Big Four. Was Dame Agatha inspired by Wallace? One wonders. I may consult the Agatha references later on.