Isadora Drake and the Radio Mystery

It's 1922 and Isadora Drake having solved one murder decides to open an office and offer "discreet inquiries" for those needing answers. Isadora's first client is a young woman concerned about the threatening letters her father has received. When she takes on the case, it's not long before developments turn a simple case into something more sinister. The new medium of radio offers clues that may help to solve the case.