The Adventure of Wisteria Lodge

"There is surely something more than that," said he; "some underlying suggestion of the tragic and the terrible. If you cast your mind back to some of those narratives with which you have afflicted a long-suffering public, you will recognize how often the grotesque has deepened into the criminal. Think of that little affair of the red-headed men. That was grotesque enough in the outset, and yet it ended in a desperate attempt at robbery. Or, again, there was that most grotesque affair of the five orange pips, which let straight to a murderous conspiracy. The word puts me on the alert."