Dick Powell starred in the Richard Diamond, Private Detective radio series as a wisecracking former police officer turned private detective. Episodes typically open with a client visiting or calling cash-strapped Diamond's office and agreeing to his fee of $100 a day plus expenses, or Diamond taking on a case at the behest of his friend and former partner, Lt. Walter Levinson. Diamond often suffers a blow to the head in his sleuthing pursuits. Most episodes end with Diamond at the piano, singing a standard, popular song, or show tune from Powell's repertoire to his girlfriend, Helen Asher, in her penthouse at 975 Park Avenue.