The Second Confession is a Nero Wolfe detective novel by Rex Stout, first published by the Viking Press in 1949. The story was also collected in other omnibus volumes, including Triple Zeck (Viking 1974). This is the second of three Nero Wolfe novels that involve crime boss Arnold Zeck – Wolfe's Professor Moriarty. In this novel he telephones Wolfe to warn him off an investigation and retaliates when Wolfe refuses to cooperate. Though the crime is solved, the ending is left open.