Books with title Trouble in Triplicate: A Nero Wolfe Threesome

" THREE STRANGERS --- Dazy Perrit was a tough guy; Ben Jensen, a wise guy; Eugene R. Poor, a nobody---- they had only one thing in common..... each thought he was marked for Murder, and each one was right ! Nero Wolf and Archie have never been in better form. TROUBLE IN TRIPLICATE. ...Three Great Novels by the GREAT REX STOUT. ( From the Back cover)