Trouble in Triplicate is a collection of Nero Wolfe mystery novellas by Rex Stout, published by the Viking Press in 1949, and itself collected in the omnibus volume All Aces (Viking 1958). The book contains three stories that first appeared in The American Magazine: "Before I Die" (April 1947) "Help Wanted, Male" (August 1945) "Instead of Evidence" (May 1946, as "Murder on Tuesday")Each of the stories involves a character who is posing as someone else. Source: Wikipedia (en)