Mr. Keen investigates a murder that's also tied into the disappearance of a valuable diamond. Original Air Date: June 9, 1949 Support the listener support campaign...http://support.greatdetectives.net Take our listener survey: http://survey.greatdetectives.net Become one of our friends on Facebook... http://www.facebook.com/radiodetectives Click here to download, click here to add this podcast to your Itunes, click here to subscribe