In which the shadow of an unseen enemy casts a sudden gloom over the secretive lodge of the Scowrers, as McMurdo receives a letter that speaks of a relentless Pinkerton detective on their trail, stirring unease among the brethren and prompting counsel of grave urgency. With the weight of impending menace heavy upon them, they resolve to confront this threat by cunning stratagem, preparing to ensnare the man whose presence may unravel their dark dominion.