At a Long Island estate, Diamond uncovers greed and deception behind a murder plot.

This Richard Diamond, Private Detective broadcast aired on May 15, 1949. It is listed as episode 4 in the archive. NBC Radio Network carried the broadcast. The cast includes Betty Moran, Dick Powell, Ed Begley, Jack Edwards, and Jay Novello. Other credited names include William P. Rousseau as director, Blake Edwards as writer, and Ed King as announcer.

The surviving recording runs about 30 minutes.

Dick Powell stars as the quick-witted private eye Richard Diamond, whose murder cases combine hard-boiled detective plotting with humor, romance, and Diamond's habit of ending adventures at the piano.

Listeners can expect mystery, crime, and drama, episodic drama in format, and humorous, lighthearted, and suspenseful in tone.