D. Ross Lederman's The Return of the Whistler 1948

"The Whistler" was an excellent radio series by writer producer J. Donald Wilson that ran from 1943-1955 (several hundred of the shows survive) with a narrator who commented on the action.  Lederman's The Return of the Whistler was the last of eight B films that Columbia made with somewhat the same formula; the seven others starred Richard Dix, who retired and was replaced in this last film of the series by Michael Duane.  The film also was less ironic than the radio series or the earlier films, even having a happy ending, as Duane goes looking for his fiancée (Lenore Aubert)who disappears on their wedding night.  There's a private detective (Richard Lane) involved and a sinister family trying to steal Aubert's inheritance.  Lederman keeps the 62-minute film moving quickly and shows considerable skill at choreographing the numerous struggles and violent altercations.