Sometimes it takes two detectives to crack the case. Fortunately, each of these radio mysteries has a dynamic duo on the scene. First, Mr. Keen, Tracer of Lost Persons and his partner Mike Kelly solve "The Case of the Ruthless Murderers" (originally aired on CBS on October 27, 1949). Nero Wolfe and Archie Goodwin take their final bow on the air in "The Case of Room 304" (originally aired on NBC on April 27, 1951). Sgt. Joe Friday and Officer Frank Smith are on the trail of counterfeiters in "The Big Listen" from Dragnet (originally aired on NBC on January 5, 1954). Finally, married sleuths Pat and Jean Abbott investigate "The Green-Eyed Divorcee" (AFRS rebroadcast from NBC on May 8, 1955).