Stout's genius expresses itself in many ways. One such way must surely be that everyone 'knows' that Nero Wolfe never leaves his New York brownstone; the author thereby making life hugely more difficult for himself by dint of his protagonist never being able to visit the scene of the crime. Well in both the stories in this volume - as frankly in a significant number of the others as well - he does indeed leave home, and in the second mystery, Booby Trap, it is precisely his visit to the location of the murder that gives him the vital clue.
Notwithstanding all that, this is fine stuff, full of the usual well drawn characters and (mostly) finely plotted twists and turns. I say mostly because Lily Rowan's actions in the first story are completely implausible, but somehow Stout manages to make the reader overlook that until one has read as quickly as possible thorugh to the conclusion.