"The Zero Clue" was originally published in "The American Magazine" and was included later in the book "Three Men Out." In this story, Leo Heller, a probability expert who has become a celebrity thanks to his math skills, tries to consult Wolfe after he calculates that one of his clients has committed a serious crime. Wolfe refuses the case, but Archie agrees to explore on his own. Perhaps to make up for the rare outings of the other two "Three Men Out" stories, in "The Zero Clue" Nero not only stays strictly at home, but manages to get most of Manhattan's homicide team in his house while he tries to decipher the mysterious clue left by the dying math wizard.