"The Adventure of the Silent Heart" is an intriguing episode of the "Frank Race" detective radio series that originally aired on February 15, 1950. In this story, Frank Race is hired to investigate the murder of a wealthy businessman's wife. As he delves deeper into the case, he uncovers a complex web of lies and deceit involving a jealous ex-husband, a greedy business partner, and a desperate woman. With the help of his trusty sidekick, Mark Donovan, Race must use his cunning and deductive reasoning to unravel the mystery and catch the killer.